6:37 Bad idea to round each value to a whole number first. That could lead to a wrong answer. For example, 5.4 rounded to 5 and 5.4 rounded to 5 added = 5 + 5 = 10 However, 5.4 + 5.4 = 10.8, rounded to 11. Round after the final calculation. In this specific case rounding first didn't change the answer. But it could with other numbers. On this, you can add another function on Desmos with the a, b, and c. Then do f(-15)+f(-4)
the formulas for the sum of roots when you've got a 2nd degree eq is -b/a, and product of roots is c/a, as we're given the sum of roots (20/3) we know that it's the sum of roots of the eq, we can find the factors by equating each of the bracket = 0 (everytime we get this type of eq), for the eq 2x^2-16x+6p, we can again use the sum of roots formula as it'll givve the sum of values of x without messing with the p, by adding all the values of p we got and the sum of roots of the third eq, we'll add them and equate them equal to the total sum of roots and find the value of p, hopr this helps, I'm not at explaining maths
For the first question or like always use this trick Make r = 0 or 1 and then substitute that point to each equation and make sure it satisfies both cuz they are same line.
There are actually two ways to solve the first problem. You need to plug in x and y, and if I plug in r as y and isolate x - I get x to see if it is the answer meaning if they match they lie on the infite number of solutions. The second doesn't really matther much, but when you write you should include all numbers like 20/3= -p/3 + 8 + 0. The third is to show how to find greatest common factor, don't just say 6. As a student, when I'll be solving these questions I'll get stuck by dividing all the numbers to get 6. Just show desmos gcf(54,216,210) = 6.
Good video. I took the SAT and got 760 math, only recommendation is explaining more common less difficult questions because these questions are super obscure and have a next to nothing chance of showing up on the real test.
Thanks, I have a different video going over 10 more common questions. But I wouldn’t say these have no chance at showing up since these questions came from real practice tests and from students who saw these on actual tests.
Yeah I recognize half of them that you pulled straight out of the college board blue book practice tests. I have taken the SAT three times(and over a dozen practice tests) and I feel like these questions are so obscure that you wouldn’t encounter them on the real test. They’re are so many crazy random questions that they can throw at you, so instead of studying each individual crazy obscure one I think that studying a bunch of Desmos tips would help a lot of people more. Just telling you what I think, you did a great job explaining them so keep it up.
Essentially, what the question means it that 48 (the base value) has to increase by a factor of 27. The way he did it is for complicated situations. The easy way is by simplifying what in the bracket and checking if it is a factor of 27, which in that case 3^3 is 27.
If you were to solve each equation for potential x values, you would get x=-p/3 x=3 x=-3 x=8 The question told you that the sum of all 4 of these numbers is 20/3, so you can set 20/3 equal to them 20/3=8+(-p/3)+3-3 The negative and positive 3 cancel out 20/3=8-p/3 20=24-p -4=-p p=4
The only factors of 35 are 7 and 5 so just think of what the other factors need to be. 9 has factors 1,3 & 9 but only 3 works since we need the middle value to add up to 36.
@@JZTESTPrep I'm having trouble with getting the same regression parameters you have. Triple checked my inputs with yours to make sure I entered them in right. Any way to do it without desmos?
Well I basically explained that we are finding which of the equivalent forms displayed 1/c as a coefficient of x that makes the first statement true where when x increases by the value of c the function increases by a factor of 27.
![[December SAT Math] Must Know DESMOS Question Patterns #1](http://i.ytimg.com/vi/v06EEiRjFbE/mqdefault.jpg)
![[December SAT Math] Must Know DESMOS Question Patterns #1](/img/tr.png)
![[December SAT Math] Don’t Miss THIS Popular Questions](http://i.ytimg.com/vi/b3v4B25CID8/mqdefault.jpg)
![[December SAT Math] 10 Must Know SAT MATH Questions (2024)](/img/1.gif)
6:37 Bad idea to round each value to a whole number first. That could lead to a wrong answer.
For example, 5.4 rounded to 5 and 5.4 rounded to 5 added = 5 + 5 = 10
However, 5.4 + 5.4 = 10.8, rounded to 11.
Round after the final calculation.
In this specific case rounding first didn't change the answer. But it could with other numbers.
On this, you can add another function on Desmos with the a, b, and c.
Then do f(-15)+f(-4)
my DSAT exam is on 7th December. Thank you so much for such a helpful video.
booklist please
hey can I add you on instagram for some questions?
I'm taking it on December 7 too!
Same here 😢😢😢
@@MuhammadHussain-q1i3g 1. the official digital SAT study guide
2.princeton review
3.the college panda
4.the ultimate guide to SAT by Erica L. Meltzer
i didn't understand the explanation of the process for the second question but the rest i did understand. i rate this video 4/5 stars thank you
the formulas for the sum of roots when you've got a 2nd degree eq is -b/a, and product of roots is c/a, as we're given the sum of roots (20/3) we know that it's the sum of roots of the eq, we can find the factors by equating each of the bracket = 0 (everytime we get this type of eq), for the eq 2x^2-16x+6p, we can again use the sum of roots formula as it'll givve the sum of values of x without messing with the p, by adding all the values of p we got and the sum of roots of the third eq, we'll add them and equate them equal to the total sum of roots and find the value of p, hopr this helps, I'm not at explaining maths
For the first question or like always use this trick
Make r = 0 or 1 and then substitute that point to each equation and make sure it satisfies both cuz they are same line.
exactly 👍
There are actually two ways to solve the first problem. You need to plug in x and y, and if I plug in r as y and isolate x - I get x to see if it is the answer meaning if they match they lie on the infite number of solutions. The second doesn't really matther much, but when you write you should include all numbers like 20/3= -p/3 + 8 + 0. The third is to show how to find greatest common factor, don't just say 6. As a student, when I'll be solving these questions I'll get stuck by dividing all the numbers to get 6. Just show desmos gcf(54,216,210) = 6.
Thanks for the feedback.
Good video. I took the SAT and got 760 math, only recommendation is explaining more common less difficult questions because these questions are super obscure and have a next to nothing chance of showing up on the real test.
Thanks, I have a different video going over 10 more common questions. But I wouldn’t say these have no chance at showing up since these questions came from real practice tests and from students who saw these on actual tests.
Yeah I recognize half of them that you pulled straight out of the college board blue book practice tests. I have taken the SAT three times(and over a dozen practice tests) and I feel like these questions are so obscure that you wouldn’t encounter them on the real test. They’re are so many crazy random questions that they can throw at you, so instead of studying each individual crazy obscure one I think that studying a bunch of Desmos tips would help a lot of people more. Just telling you what I think, you did a great job explaining them so keep it up.
Can someone explain the factoring on Q3?
yes i have the same question
I like the youtubers who use a little humor while teaching..............it's you.
underrated video
pleaseee solve the question 3 manually- without using desmos
Very helpful video ❤. I need more of these
pls do the 2nd part! this one was extremely helpful
Please make another one of these I NEED a 1500+
1440 rn btw
Make sure to check out my other video going over 10 “hard” commonly tested questions
very helpful. tysm!!
Thank you man!
Can you make video about using desmos i couldn't get no 4
how did u find the zeroe for 2x^2 - 16x + 6p
using -b/a = 8? ive never seen that formula in my curriculum, is it widely used in America or sm shit?
-b/a gives u the sum of the roots, so this gives u all the roots of 2x^2 - 16x + 6p added up.
@@manhaagarwal2747 ohh i remember learning that in my junior year, thanks a lot
how to use 2nd question for desmos?
I dont get question 3
Do I need a ($50 - $100) calculator to do Question 4 on a test sitting?
Nope. Desmos is provided on the DSAT
could someone explain the last question? i didnt understand it fully
Essentially, what the question means it that 48 (the base value) has to increase by a factor of 27. The way he did it is for complicated situations. The easy way is by simplifying what in the bracket and checking if it is a factor of 27, which in that case 3^3 is 27.
@iam_kemialiu oh i kind of get it now, thanks!
Can we solve question 4 without using desmos?
hello can we do 2 th question with desmos
You can but in my opinion it is much more tedious and is easier with the method I showed.
@@JZTESTPrep can u show how can i do this question with desmos
how can we calculate 4 without desmos?
how would you do 4 without desmos?
For question 4 what gave it away that you couild use a regression?
We were given the function and two points on it
is there a way to solve QN. 1 without desmos. easy yes, but tedious. is there an easier way?
just plug in each values from the answer choice and check if lhs equals rhs
Why are we adding 8 to -3/P for Q2
If you were to solve each equation for potential x values, you would get
x=-p/3
x=3
x=-3
x=8
The question told you that the sum of all 4 of these numbers is 20/3, so you can set 20/3 equal to them
20/3=8+(-p/3)+3-3
The negative and positive 3 cancel out
20/3=8-p/3
20=24-p
-4=-p
p=4
These videos are amazing, but for question 5, collegeboard's explanation more understanding than yours. Thanks a lot for this videos buddy.
they need to remove the use of desmos so fast on the SAT, it's just plain stupid and abused for questions that definitely don't need it.
yes dude the vid was terrible! just playin, whered u get those problems from? finally som1 with realistic stuff
Thanks. #1,2 and 5 came from blue book prac tests. #3 and 4 came from people who took the actual test in Novemeber and October and saw those questions
How did you FOIL that @4:06?
The only factors of 35 are 7 and 5 so just think of what the other factors need to be. 9 has factors 1,3 & 9 but only 3 works since we need the middle value to add up to 36.
@@JZTESTPrep I'm lowkey lost, is there any video explaining this strat?
Can anyone help me for no 4
Yeah what part of it are you struggling with?
@@JZTESTPrep I'm having trouble with getting the same regression parameters you have. Triple checked my inputs with yours to make sure I entered them in right.
Any way to do it without desmos?
@@JZTESTPrep wait never mind I renetered it and it worked. Could we get a tut on doing it by hand- no desmos though?
bro in question 5 u said the wording is pretty tricky and tried explaining it and u literally re read the question without explaining nothing
Well I basically explained that we are finding which of the equivalent forms displayed 1/c as a coefficient of x that makes the first statement true where when x increases by the value of c the function increases by a factor of 27.