ISEE Mathematics Achievement Question 88: Answer and Explanation

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Question: 88

4. Solve for x: = 10.

A. ± 5
B. ± 10
C. ± 20
D. ± 25

Correct Answer: A

Explanation:

The correct answer is (A). The square of a number divided by 2.5 equals 10. The square of the number, then, equals 10 multiplied by 2.5.

x2 = 10 × 2.5

x2 = 25

x = ±5