Left side: combine powers of fractions until you get 5 to the power of 7/8. On the right side, 125^x is the same as 5^3x. 3x = 7/8; x = 7/24. You can also do it by reducing fives until you get 5^(3.5 -12x) = 1, then 3.5-12x = 0, x = 3.5/12, which is the same result
20 years ago as an engineering student and probably one of the best times of my life, I could just zip through this equations. Thanks for the memorys. NorCal
@@bertblankenstein3738He rewrited many time with the aims : to all kinds of the viewers who had watched this video. I think he is a good man when he did so.Tks!
@@MathsExplorer24 It's not the method; it's the speed. I think you could present this clearly in 3 or 4 minutes instead of 10 simply by being more efficient.
@@berkeleyrc That's how I did it in my head very quickly as well. I do like to see how other people solve things though, shows how different brains work. As a former math teacher, I appreciate someone who shows all their steps as well
If you do the sqrt2 maths it is easier and faster, you can do it in your head then. You will have 5^7/8 = 125^x then power to 3 or sqrt3 you will get with power 3, 125^7/8 = 125^3x then 7/8 = 3x and x= 7/24
1/write correctly seven instead 1 2/the task can also be easily calculated from the last root on the right to the largest root without square very quickly!Try!
These problems seemed like a headache and nightmare during school days but now it is ok. Thanks to the patience which I have gathered over the years...
I went with the second method because that is more easier logical way to see it and faster if you are not prepared to do the first way. So I spent a lot of time doing it in my head without any paper and pen and I came to the right answer. Then I saw that your video continued. 😢😊
Brilliant video, however think a longer form with voice audio explaining this would be little more helpful. Just watching you right this out meant nothing to me. But I would love a better explanation how this was solved
During verification, separately solve LHS and RHS, because when you put an = sign from the beginning, it states that they are equal, so there is no need for verification. Hope you understand what I'm trying to say.
Personalmente avrei seguito un metodo più semplice. Avrei trasformato le radici di sinistra raggruppando tutti i 5 e a destra avrei scomposto il 125 nei suoi numeri primi ottenendo √√√5^7=5^3x 5^(7/8)=5^3x 3x=7/8 X=7/24
I thought for sure I aced algebra when I took my first test. The teacher failed me because I answered every problem with an "X" I thought "X" was the unknown. The answers were unknown to me.
Four parts to a square the center 25 would be the one in the center of the square can you have a 125 X found extending for an extra 25 in a square root |__|square ruot
@@elenaterskova6422 а ещё быстрее завести множитель под знак корня, слева будет корень шестой степени, а потом же и возводить в шестую степень левую и правую часть.
Not 'a bit unnecessary' but totally unnecessary. These so-called YT maths teachers have no insight and no artistic feeling for mathematics. All they can teach is low-grade drudgery for unthinking students.
Where there any of those square/ root operations that could have had a +/- answer? Like sqrt(25) can be -5 as well. Maybe with the operations involved it doesn’t matter. But could this have two correct answers?
5 is a positive number, so the square root of 5 has only one positive answer. In the case, for example x^2 = 4 ==> x = + 2 or x = - 2 ( two answers ) because we don't know exactly x is a positive or a negative number. We have to choose both + 2 and -2 .
@@pnwtutoring No. The square root of 5 can be either positive or negative. Either way, it an irrational number, but using approximate values, (-2.236) x (-2.236) = +4.999696.
@@arjanhulsebos No. Square root is a function that you apply to a number and it has 2 values, one positive and one negative. According to Wikipedia "Every positive number x has two square roots".
@@chrisengland5523your problem isen't really a mathematical problem: Mathematician just defined that sqrt(5) ist just the positiv solution of 5=x^2. So formally the solution of 5=x^2 ist sqrt(5) and -sqrt(5), not just sqrt(5). If wiki says different then it is wrong. Btw. the reason why it is defined like that to keep sqrt(x) beeing a function (mathematic function, not same like an function you know from programming), which makes it easier to handle. So after the formal definition of sqrt there arent more solutions. But actually there is a related Problem happening while solving that equation: squaring the equation leads to possible inproper results, which makes the verification at the end necessary.
How the heck can this be useful. I'm a 60 year old linguistics professor that has travelled and lived all over the world. I was a paratrooper for 15 years. I've never had any occasion in which something like this had any relevance. I've built bridges, and shelters without any of this. How is it not a waste of time?
Imagine making a 10min vid on a r3t4rd3d piss easy problem, solving it via the most intuitive approach anyone would do and calling it a "nice simplification" OMEGALUL
Left side: combine powers of fractions until you get 5 to the power of 7/8. On the right side, 125^x is the same as 5^3x. 3x = 7/8; x = 7/24. You can also do it by reducing fives until you get 5^(3.5 -12x) = 1, then 3.5-12x = 0, x = 3.5/12, which is the same result
это решение проще и быстрее.хотя я по английски ни бум бум.но решение на поверхности.к тому же многократное возведение в квадрат не желательно,
That's what I did!
👌🏻👌🏻
Я тоже степени приводил к ⅞. Так намного проще и быстрее
7/8 how to reduce...?
Finished school 58 years ago. It's fun to review watching though some commenters show shorter ways. Thanks you all.
20 years ago as an engineering student and probably one of the best times of my life, I could just zip through this equations. Thanks for the memorys. NorCal
Sou can simplify the left side as 5 raise to power 7/8 and the right side as 5 raise to power 3x and equate them to get the required answer.
Hint. Solve by inspection. Or Log5 both sides.
And this would take about one minute to do. No need to rewrite so many times.
@@bertblankenstein3738He rewrited many time with the aims : to all kinds of the viewers who had watched this video. I think he is a good man when he did so.Tks!
Just square it 3 times.
LHS becomes 5⁷.
RHS becomes 125^8x = (5³)^8x = 5^24x.
So x = 7/24.
Just a few seconds in mind.
where did you get that 7 from?
@@alejandropulidorodriguez9723 square three times
D'accordo
@@alejandropulidorodriguez9723 Square it 3 times. LHS becomes 5^4*5^2*5^1=5^(4+2+1)=5^7
LHS=7/8 as the power of 5. It is not 7, just check your process again
Don’t spend the first thirty seconds rewriting the question.
@@MathsExplorer24 It's not the method; it's the speed. I think you could present this clearly in 3 or 4 minutes instead of 10 simply by being more efficient.
Honestly it took me just a few seconds:
sqrt(5*sqrt(5*sqrt(5))) = sqrt(5)*sqrt(sqrt(5))*sqrt(sqrt(sqrt(5))) = 5^(1/2)*5^(1/4)*5^(1/8) = x^(7/8)
@@berkeleyrc That's how I did it in my head very quickly as well. I do like to see how other people solve things though, shows how different brains work. As a former math teacher, I appreciate someone who shows all their steps as well
@@MathsExplorer24For the elementary schoolers.
@@MathsExplorer24it’s not. It’s already written down. That makes as much sense as writing the same thing 2 more times. Or 3, or 4. It’s not a step.
For the impatient, set the playback speed to 2x.
And for the "normal" folk, use 3x.
5^7/8 =5^3X 3X=7/8, X=7/24
Could have been done much simpler like you said, so much wasted time... And this music....
5 7/8'e nasıl ulaşıldı? Yöntem nedir?
Vas introduciendo dentro de la raíz
@@alkara21 square root of x can be written as x to the power 1/2
Excelente .Muito Obrigado . De Portugal
Very well explained,had forgotten my maths after 50 yrs
Or just rewrite the left hand side in a few steps as a 5 exponential, then
5^(7/8) = 5^3x
3x=7/8
x = 7/24
Would also say that is the faster solution. Actually he used that way for verifying his result.
Bonjour, Je remplace toujours la notation" racine carrée" par "puissance 1/2". C'est toujours plus simple. Merci pour cette démonstration.
If you do the sqrt2 maths it is easier and faster, you can do it in your head then.
You will have 5^7/8 = 125^x
then power to 3 or sqrt3
you will get with power 3, 125^7/8 = 125^3x
then 7/8 = 3x
and x= 7/24
1/write correctly seven instead 1
2/the task can also be easily calculated from the last root on the right to the largest root without square very quickly!Try!
it is interesting. I kept squaring to get rid of the square root. then the problem is transformed like 5^7=5^(24x). so x=7/24. thank you~~~
These problems seemed like a headache and nightmare during school days but now it is ok. Thanks to the patience which I have gathered over the years...
Excellent way of doing and steps. I am a non maths teacher but understood your steps easily. Thankyou and hope you would send more
Simple explanation that I enjoyed reviewing my past knowledge from 35 yeras ago!
Square 5 equals y so y elevated by 7/4 equals y elevated by 6 elevated by x. 7/4lny equals 6x lny . So 7/4 equals 6x. X equals 7/24 equals 0.291667
The exact answer is 7/24. Decimal number is called an approximate learn the difference.
I returned to my schoolhood appr. 55 years ago. Thanks. 🍀
How is a question like this applied to real life situation
@@SandraDevant …it means I love this maths min. 55 years.
@@SandraDevant It depends: if your "real life situation" is being a cheap uneducated labour OR something more than that 😊
😁👌🏻
My, my, you did it the hard way.
تمرين ممتاز وشرح جيد والتححق من الحل ممتاز
simple and detailed. congratulations. good video ❤
👌🏻👌🏻
Make me feel interesting in maths. Thanks.
So enjoyable, a very thorough and systematic work.
Gostei! Até parece que é falta do que fazer. É gosto pela arte.
I went with the second method because that is more easier logical way to see it and faster if you are not prepared to do the first way.
So I spent a lot of time doing it in my head without any paper and pen and I came to the right answer. Then I saw that your video continued. 😢😊
Out standing, thanks.
Brilliant video, however think a longer form with voice audio explaining this would be little more helpful. Just watching you right this out meant nothing to me. But I would love a better explanation how this was solved
Good question 😍
During verification, separately solve LHS and RHS, because when you put an = sign from the beginning, it states that they are equal, so there is no need for verification. Hope you understand what I'm trying to say.
I did this in my head and it took about 20-30 seconds. 9 minutes, jeez
👏👏👏👏
Very good presentation 👍
Good problem actually was fun thanks for taking time tough to remember steps lol when u r old like me 😅
Very good
Very interesting
Very much enjoyed.
Why not just use the fractional exponents and get to the answer in half of the steps and less math along the way?
👌🏻👌🏻
Nicely done!
Here’s easier way
After u know that 5=125^8x-2 and 125=5^3
So its 5=5^3(8x-2)
5^1=5^24x-6
Then 1=24x-6
So X = 7/24 🎉🎉
Very beautiful.....
Nice presentation
Nice explanation
வீர லெவல்
Nice calculation
Personalmente avrei seguito un metodo più semplice. Avrei trasformato le radici di sinistra raggruppando tutti i 5 e a destra avrei scomposto il 125 nei suoi numeri primi ottenendo
√√√5^7=5^3x
5^(7/8)=5^3x
3x=7/8
X=7/24
Haga un vídeo y nos lo explica paso a paso muy didácticamente. Gracias
👍 와
Good.
Some Mathematicians love to make things complex. 7/8=3x tthen x=7/24. That's all no need more more texts
Задача для устного счета для получения минимальной положительной оценки.
Sweet proof!😀
I thought for sure I aced algebra when I took my first test. The teacher failed me because I answered every problem with an "X" I thought "X" was the unknown. The answers were unknown to me.
Tnx so much
your X is like multiplication symbol. use small x to avoid confusion
Brillant
Masterfully done.
Thanks for this very good vidéo 👍
Or log 5^{7/8) divided by log 125!
❤
1/2 + 1/4 + 1/8 = 3х, done
Im really very weak in maths.. May help this channel think so thanks. 43 yrs old house wife.. Granny also mom for 10 th std daughter. ☝
Four parts to a square the center 25 would be the one in the center of the square can you have a 125 X found extending for an extra 25 in a square root |__|square ruot
👍👍
很好。
good music.
Решается в уме за пару минут)
Как?
@@elenaterskova6422 представляешь корни как степени со скобками и 125 приводишь к степени с основанием 5. Дальше очевидно.
@@elenaterskova6422 а ещё быстрее завести множитель под знак корня, слева будет корень шестой степени, а потом же и возводить в шестую степень левую и правую часть.
Si mi amor❤️
A bit unnecessary, wasn’t it? I just squared the equation 3 times, getting 5^7 = (5^3x)^8 = 5^24x. Hence 24x = 7…
Not 'a bit unnecessary' but totally unnecessary. These so-called YT maths teachers have no insight and no artistic feeling for mathematics. All they can teach is low-grade drudgery for unthinking students.
Where there any of those square/ root operations that could have had a +/- answer? Like sqrt(25) can be -5 as well. Maybe with the operations involved it doesn’t matter. But could this have two correct answers?
5 is a positive number, so the square root of 5 has only one positive answer. In the case, for example x^2 = 4 ==> x = + 2 or x = - 2 ( two answers ) because we don't know exactly x is a positive or a negative number. We have to choose both + 2 and -2 .
@@pnwtutoring No. The square root of 5 can be either positive or negative. Either way, it an irrational number, but using approximate values, (-2.236) x (-2.236) = +4.999696.
@@arjanhulsebos No. Square root is a function that you apply to a number and it has 2 values, one positive and one negative. According to Wikipedia "Every positive number x has two square roots".
@@chrisengland5523your problem isen't really a mathematical problem: Mathematician just defined that sqrt(5) ist just the positiv solution of 5=x^2. So formally the solution of 5=x^2 ist sqrt(5) and -sqrt(5), not just sqrt(5). If wiki says different then it is wrong.
Btw. the reason why it is defined like that to keep sqrt(x) beeing a function (mathematic function, not same like an function you know from programming), which makes it easier to handle.
So after the formal definition of sqrt there arent more solutions.
But actually there is a related Problem happening while solving that equation: squaring the equation leads to possible inproper results, which makes the verification at the end necessary.
Sweet
Amazing🙏👏👏many thanks!
This X was left in school and college now it is on RUclips. X is still a Mistry 😂😂😂
Beautiful
X=7/24
How did I found on my head 1/4 at first lol 😂
I go with 125.25.5=5^24x
Это уравнение решается на раз, два за пару минут, примените свойство степени.
With a scientific calculator this goes faster by taking ln of both sides.
5^(7÷8)=5^(3х)
7÷8=3х
х=7÷24
Bro really spent 10 minutes for this💀💀💀💀
How the heck can this be useful. I'm a 60 year old linguistics professor that has travelled and lived all over the world. I was a paratrooper for 15 years. I've never had any occasion in which something like this had any relevance. I've built bridges, and shelters without any of this. How is it not a waste of time?
Lengthy process.
7/24
А почему нельзя было сразу 5^7/8=5^3х отсюда 3х=7/8 и х=7/24. По сути всего 2 шага. Это же короче.
Took too long.
Just square both sides three times and express the right hand side in terms of 5.
Lastly, compare the exponents.
Super bro
Если бы не громкая музыка, все отлично
Hence try to do some calculation at the back of your head
I see your vids and I wonder: “how many meters down is your paper?”
Just kidding. Nice work!
By verification method also we can solve more quickly.
15
This answer only took10 seconds in my mind 😂
1/2×1/2×1/2=1/8
1/2
Nu am răbdare să te urmăresc.
Mă uit la alții.
Ești încet
Bahut long time lga solve me.
Esko to hum 1 minute me solve kar dete😂😂😂😂
Imagine making a 10min vid on a r3t4rd3d piss easy problem, solving it via the most intuitive approach anyone would do and calling it a "nice simplification" OMEGALUL
Слишком подробно, очень подробно.
1/6
7/24.