Question

Which equation results from taking the square root of both sides of (x – 9)2 = 81?

Answer 1

x – 9 = ±9

A on edge

Answer 2

x-9 = ±9

Explanation:

(x – 9)^2 = 81

Take the square root of each side

sqrt((x – 9)^2 = ±sqrt(81)

x-9 = ±9

Add 9 to each side

x-9+9 = 9 ±9

x = 9+9 and 9-9

x = 18,0