Question

Solve for x 2x^2 = 128

Answers
-6 and 6
-8 and 8
-32 and 32
-64 and 64

Answer 1

Divide both sides by 2

x^2 = 128/2

Simplify 128/2 to 64

x^2 = 64

Take the square root of both sides;

x = √64

Since 8 * 8 = 64, the square root of 64 is 8

x = -8 and 8

Answer: B -8 and 8