Question

Solve the quadratic equation.

(x + 3)2 = 64
A) x = 5 or -11
B) x = 11 or -5
C) x = ± 3
D) x = ± 11

Answer 1

The answer is A. You start by "undoing" the square on the left by taking the square root of both sides, which gives you, simplified version here, x+3=+/-8. Move the 3 over by subtraction to get 2 different values for x now: x=8-3 which is 5, or x= -8-3 which is -11.