Question

Use the rules of equations and inverse operations to solve the equation. In your final answer, include all of your work. 4 -x^2 = -16

Answer 1

±2√5

Explanation:

4 -x^2 = -16 can be rewritten as

20 = x^2.

This quadratic has two solutions: find them by taking the square root of both sides:

x = ±√20 = ±√4√5 = ±2√5