Question

use a calculator.15. Select all the numbers that are solutions to the equation x2 = 15. (2 pt)A. 225B. 225C. 7.5D. 715E. -V15

Answer 1

√15, and -√15

1) Considering the equation below, let's solve it:

$\begin{gathered} x^2=15 \\ \sqrt[]{x^2}=\sqrt[]{15} \\ x=\sqrt[]{15},\text{ -}\sqrt[]{15} \end{gathered}$

2) So the answer is √15, and -√15

Since (√15)² = 15 and (-√15)²=15