Explanation for Question 20 From the Math (Calc) Section on the 2019 May Sat
Question 20 says if X is a solution to the given equation, 2 which of the following is a possible value of X plus five. 3 So if you look at the current equation that we have written up here, 4 no part of this has X plus five in it, 5 which means that we somehow need to change this equation. 6 So that just one side of the equation says X plus five. 7 And the way to do that is to factor the 8 bottom here into X plus five square. 9 This is equal to X plus five times X plus five. 10 So that's how I'm going to rewrite it. Then you can multiply both sides 11 by X plus five squared and you get one is equal to four times 12 X plus five squared. You can divide both sides by four to get one 13 fourth is equal to X plus five squared, 14 and finally root both sides to get root. 15 One over four is equal to X plus five. 16 So our answers root one over four, but of course we need to simplify 17 that. And route 1 0 4 is just equal to root one over group four. 18 And we know that's equal to one half, 19 which means that X plus five is equal to one half. 20 And the answer is.