Question

Theo started to solve the quadratic equation (x + 2)2 – 9 = –5. He added 9 to both sides and the resulting equation was
(x + 2)2 = 4. Next, he took the square root of each side.

Which was the resulting equation of that step?

x + 2 = ±4
x + 2 = ±2
x + 2 = ±8
x + 2 = ±16

Answer 1

x + 2 = ±2

Explanation: From (x + 2)^2 = 4, taking square roots gives x + 2 = ±√4 = ±2 (so x = 0 or x = -4).