khan academy just makes my life easier. My teacher makes everything all complicated but Sal just makes it simple and easy to understand. THANK YOU KHAN ACADEMY
My teacher: ***stacks piles of papers on my desk*** DO IT! You: OK... Let's go over this slowly YOUR THE BEST!! I ACTUALLY UNDERSTAND WHAT I'M DOING IN MATH CLASS NOW!!! :D
I’m taking algebra 2 this year and the original algebra 2 teacher went to another school and now I’m stuck with a teacher who’s said he has never taught this before. So, this really saving my career.
Well... the consistancy in your video's is through the roof. i've just started A levels after getting a good grade in Math in Gcse ... there is quite some confusion among the topics i'm studying in this new curriculum... some of the topics i've had trouble in I've searched for help, YOU have covered them all. Thank you.
I really like your videos Sal, they are very useful for me. Quick comment: Instead of saying discriminant=zero means one solution, I know it would have saved me many hours of research if someone told me that we still have two solutions (like always with quadratics) but in this case the solution repeats two times. Eg: x^2-4*x+4, even though it's discriminant is zero, it still has two solutions, which are x=2 and x=2. Again great videos and I hope you do more calculus and physics videos!
It touches the x-axis in two places, so the parabola goes down touches one point on the x-axis and then when it comes up again it touches a different point on the x axis.
@Rowan9789 if 5x^2-6x=0 the constant is zero. you could feasibly write the same equation as 5x^2-6x+0=0. either way, the y-intercept would be 0, as would the x-intercept.
wooooohooo imaginary numbers!!!! u should add imaginary numbers to your linear algebra playlist. 'cause it would help me with my college course! especially rref'ing a system composed of imaginary numbers
sir khan one question, for the first discriminant which is bsquare - 4ac > 0 you said there will be two solutions positive and negatice but in this case, the negative is less than zero so how come there can be two solutions. In this case can we say both the values which are executed are positive instead of one postive and one negative since it would consider that one of them is greater than zero but not the other one
@paulceltics yea seriously. i live alone but my parents still support me. and they would have made me enlist of i didnt end the my junior year with C's.
I gotta give it to you, I learned more from you than my teacher
Nate Kosty lol my teacher tells us to watch this guy
if she knew him, theyd prolly marry each other
Nate Kosty sameeee
Nate Kosty i know right
Edgel Alarcon go
The amount of OOOOHHHH!!!! moments I had after watching this.......
Wow. Thanks for making me feel bad. I had none😪
@@sayloraks9334other people learn differently it good to let those who dont know to learn
I learned in 2 minutes of this video what took me 1 hour in class to get confused over
same
khan academy just makes my life easier. My teacher makes everything all complicated but Sal just makes it simple and easy to understand. THANK YOU KHAN ACADEMY
Deciding to watch this video is one of the best decisions I ever took in my life.
Sal is the best math teacher in my opinion. He simplifies the mathematical computation and makes it much less confusing than most Math teachers.
Thank you dude! I fell asleep in class. Watching your videos are going to help me get through Algebra 1.
I learned more from you than my Teachers way less confusing
oh my god, thank you so much for this because math has not been life.
+Asha A. crystal castles!
mmmmmm... saying "oh my god" is technically blasphemy
@@randomfandom33 be quiet
Teacher in this academy is better than my teacher.
i dont think i would pass tests without you. cheers mate
Watching this because my teacher got mad and she didn't teach this lesson to us but we're having a quiz about this tomorrow. Thanks a lot.
Every time I finish a video is like "this is so easy how did i not understand it before"
omg what would happen if khan academy dies, then i would fail every maths test LOVE YOU KHAN ACADEMY KEEP IT UP
khan academy will never die (sal will tho :( ) lol
Rajatkamal Polisety I will make sal live 4ever
My teacher: ***stacks piles of papers on my desk*** DO IT!
You: OK... Let's go over this slowly
YOUR THE BEST!! I ACTUALLY UNDERSTAND WHAT I'M DOING IN MATH CLASS NOW!!! :D
2021
2024
What if you have to solve for no real solutions with [i]
you can still solve them using the formula. if b^2-4ac is negative [(-b^2+4ac)^(1/2)].i equals to (b^2-4ac)^(1/2)
Now im done with my modules
Aced my final. thanks breh! u saved me from military school.
how old u now
RIZZ
@@samsungsaiyam1090 hshaahhaah u wrote that comment 12 years ago, I was js wondering
That really helped
Your handwriting is superb
I’m taking algebra 2 this year and the original algebra 2 teacher went to another school and now I’m stuck with a teacher who’s said he has never taught this before. So, this really saving my career.
I actually started jumping of joy because I finally understood it
My god 11 years ago
Cant belive
Great video straight to the point and clear, great job
helpful af
Well... the consistancy in your video's is through the roof. i've just started A levels after getting a good grade in Math in Gcse ... there is quite some confusion among the topics i'm studying in this new curriculum... some of the topics i've had trouble in I've searched for help, YOU have covered them all. Thank you.
You save my math life thank you so much
Agree
+Bryan Nguyen +Ryan Houston he may have saved your math lives but your grammar lives needs work.
+GEGE77R6 How can you possibly deduct anything about someone's mastery of English grammar when he only commented one word?? Jackass
i can safely say this explained and taught me more than my school.
I really like your videos Sal, they are very useful for me. Quick comment:
Instead of saying discriminant=zero means one solution, I know it would have saved me many hours of research if someone told me that we still have two solutions (like always with quadratics) but in this case the solution repeats two times. Eg: x^2-4*x+4, even though it's discriminant is zero, it still has two solutions, which are x=2 and x=2.
Again great videos and I hope you do more calculus and physics videos!
omyghad, thankyouuu!!! ❤️
This is very good i loved it..but i have a question..how did we explore the formula of discriminant ?
5:42 wouldn’t you move the a to the other end with everything else? My teacher says x^2 has to be positive
Very helpful. Thanks!
Khan academy should be the most subscribed channel on RUclips change my mind
Is B always negative?
ItsYour Gamer yes, it’s part of the equation.
if the value for B is already negative, then when you plug it into the quadratic formula it would then be positive.
I miss 2010
Same
watching after 11 years also.....
Can we use the discriminant formula when the equation in linear?
You save me from my sufferring thank you
Thank you! ❤️
Thank u khan acedmy
It touches the x-axis in two places, so the parabola goes down touches one point on the x-axis and then when it comes up again it touches a different point on the x axis.
@Rowan9789 if 5x^2-6x=0 the constant is zero. you could feasibly write the same equation as 5x^2-6x+0=0. either way, the y-intercept would be 0, as would the x-intercept.
i wish i had you as my teacher instead sal
So I put the "i" at the end of the solution in Aleks when the answer is negative?
Well done! What S/W and H/W set-up do you use as a "black board"? It's very easy on the eyes!
Iam watching it now and thanks
what real life application does using the discriminant have?
You can use it for engineering (and stuff like that). Also, if you want to go to law school or med school you have to know it.
SpiritWolf2K Hahahahha, yeah.
oJose developing your brain
Employment 😂😂😂😂
I learned more in 10 mins than in 2 hours from my class thx 🙏🏽
how does two solution look like in graph ??
it's gonna form a parabola. the two solutions are the two points where the parabola will hit the x-axis.
man it helped so much that i feel like not going to school anymore
Hello sir, please which software are you using to teach? its pretty cool
aiight bro. cya
SO HELPFUL! Thank you!
wooooohooo imaginary numbers!!!! u should add imaginary numbers to your linear algebra playlist. 'cause it would help me with my college course! especially rref'ing a system composed of imaginary numbers
THANK YOU THIS IS SO GOOD
but I've a question how does it matter if it is a rational solution or an irrational solution
Nobody Iknow Yes.
@@KayMarie-es3cr what does yes mean
Nobody Iknow Sorry. I thought you asked if it matters if it’s rational or not
@@KayMarie-es3cr it is completely fine but do you know how it matters if so
Nobody Iknow do you mean why it matters?
wait,wait
so where do you get on 5:24
(the orange color)
there is discriminant
so where did you get the 9-4? ( Discriminant 9-4(1)(6) )
b is 3 so b squared is 9.
You subtract 4ac from b.
4*a (which is1)*c(which is 6)
So, b-4ac is 9-4*1*6
a must be equal to -1 not 1
How will I know if it is rational or irrational ?? And how will I know if it is complex ??
is there a nature of roots video? i cant find one and this is the lesson in my school
thankss this video helped alot
gucci jessi hey
sir khan one question, for the first discriminant which is bsquare - 4ac > 0 you said there will be two solutions positive and negatice but in this case, the negative is less than zero so how come there can be two solutions. In this case can we say both the values which are executed are positive instead of one postive and one negative since it would consider that one of them is greater than zero but not the other one
@loversjustkeeploven really? thats pretty awesome
THANK YOU SOOOOO MUCH (:
why I cant find this video in the website??
thank you for the arabic translation
Thank you!
x^(2) + 3x - 6 = 0
x = (-3 + sqrt (-15)) ÷ 2
x = error
b^(2) - 4ac = -15
Thanks
What about for all real numbers?
You are way better than my math teacher, and I wish you were my science teacher because he is just so... argh. =__=
thanks bro
This is dope
if the discriminant b^2-4ac=0, the graph of f(x)=ax^2+bx+c, a not equal to 0, will touch the x-axis at its vertex? True or false?
amazing
i came from art videos to this
If there is cubic equation?
@khan how come we get 2 parabola for a quadratic equation... won't the graph be a single parabola that meets x-axis twice...
판별식이 0이라는것은 곧 2차방정식이 완전제곱식의 형태라는 것과 같네요
잘 배우고 갑니다
oh never mind!!!!!! :)
With the internet, who needs school?
how did u get 4?!!!!
what if its not equal to 0 and hahs 4 numbers in the equation
@paulceltics yea seriously. i live alone but my parents still support me. and they would have made me enlist of i didnt end the my junior year with C's.
Can anyone give me an example of discriminant
love ya mate, noice
What if the real solution isn't rational???
Pls tell
IF ONLY MY MATH TEACHER TAUGHT LIKE THIS -____-
0 illuminate
Why am I learning this in algebra 1 if this is algebra 2
lookinglasstie did u find your answer after 3 years?
The discriminant of the 3rd equation is 9489.000000000002
I don't have a point. My comment had nothing to with you. Now good day, sir.
JOE LIKES GUYS
Thumbs up if you have an A in Algebra I! :D
yeeyyy
1 person in 7 years.
Omg 10 year ago
watching this as my parents argue so cute XoXo
the third example is not a perfect square, it is 7567 and the square root of that is 86.98850499...
There are other square roots that might go into that number. (4,9,16,25,36,49,64,81 etc.)
So no one watches this in 2021?
When the discriminant is zero there is technically one solution but isn't it a double root?
I'm quite surprised that you replied to me after 11 months. Smh..