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