Explanation for Question 3 From the Math (No Calc) Section on the 2018 April Sat
Question three asks, which of the following expressions is equivalent to X squared 2 plus 10 X plus 21. 3 So to figure this out, I'm just going to work backwards from the answer 4 choices and see if they equal our original expression. 5 So first with answer choice, a X times X is X squared, 6 plus nine X plus X plus nine plus 7 12. And when we add and subtract like terms here, 8 this becomes X squared plus 10 X plus 9 21. And this does equal or original equation. 10 So answer choice is actually the correct answer.