Explanation for Question 13 From the Math (Calc) Section on the 2019 October Sat
So looking at number 13, what's probably the best way to go about this 2 question is actually just to plug in the numbers that were given to see, 3 which makes both quantities equal to each other. 4 Um, if you wanted to do it the more Matthew way, 5 which would definitely take more time here, you could take each quantity, 6 foil it out, and then you would get a quadratic equation that also has 7 a square root of accident and then factor from there. 8 But definitely the best way to go about this question is going to be 9 to plug it in and just see what chance are you get. 10 And whenever you do something like that, you never want to start with the 11 bottom or the top. You always want to start with a middle number, 12 because that way, if you know, your answer is too big or too small, 13 you can move in a direction that will help you. 14 For example, if your answer was too small, 15 right, then you would want to move down to a bigger number. 16 And that helps you save time by not checking the really small number at 17 the top. So we'll start with B right? 18 One of the middle numbers here, and we'll do eight minus the square root 19 of four squared is equal to four plus the square root of four squared. 20 And now we're just going to test and see if it's true. Now, 21 route four is two. So eight minus two is six squared. 22 And again, reports is two and four. 23 Plus two is six squared. So that's 36 is equal to 36. 24 So we actually got lucky here. And the number that we picked...