Explanation for Question 15 From the Math (No Calc) Section on the 2017 October Sat
Question 15 asks what is the set of all solutions to the equation? 2 Root X plus two is equal to negative X. 3 So I'm going to start by just plugging in answer choices. 4 So let's start with negative one. 5 Negative one. Plus two is equal negative negative one. 6 So this becomes route one is equal to one. 7 And route one is just one. So negative one is correct. 8 So we can eliminate C and D. We know at least negative one is 9 a solution to the equation. Now we can try and test two. 10 So let's do that down here. Route two plus two is 11 equal to negative two. Well, 12 route two plus two is four and route four is two 13 and two is not equal to negative two, 14 which means that answer choice a is wrong. 15 And B as the correct answer, because negative one is the only solution to.