ISEE Word Problems Question 241: Answer and Explanation

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Question: 241

5. What is the solution set for x² + 64 = 0?

A. 8
B. 8i
C. ±8
D. ±8i

Correct Answer: D

Explanation:

The answer is D

First subtract 64 from both sides: x² = -64. Take the square root of each side, remembering the there are two solutions for x²: x = . Separate the 64 from -1: x = . The square root of negative one is not a real number and is called the imaginary number i. Thus, x = ±8i.

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