ISEE Word Problems Question 287: Answer and Explanation

Home > ISEE Test > ISEE Word Problems Practice Tests

Test Information

Use your browser's back button to return to your test results.
Do more ISEE Word Problems Practice Tests.

Question: 287

6. If b² + 25 = 0, which represents all possible values of b?

A. 5
B. ±5
C. 5i
D. ±5i

Correct Answer: D

Explanation:

First subtract 25 from both sides: x² = –25. Take the square root of each side, remembering the there are two solutions for x²: x = . Separate the 25 from –1: . The square root of negative one is not a real number and is called the imaginary number i. Thus, x = ±5i.

Previous Next