Explanation for Question 31 From the Math (Calc) Section on the 2019 March Sat
Question 31 asks what value of X satisfies the equation above. 2 So all we have to do here is square, 3 both sides. So that gives us 1 21 is equal 4 to X plus four, and then subtract four from both sides. 5 And when we do that, we get one 17 cause equal to X. 6 So the answer here is 117.