Digital PSAT Math Practice Question 171: Answer and Explanation

Question: 171

If x2 > y2 which statement must be correct?

  • A. x > y
  • B. x < y
  • C. xy
  • D. x3 > y3

Correct Answer: C

Explanation:

(C) x and y could both either be negative or positive to make this true. Therefore, the only thing we can safely assume is that x and y are different. You can try this with sample values that make this expression true:

x

y

x2 > y2

-5

4

25 > 16

6

-1

36 > 1

3

0

9 > 0

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