Question

To solve x^(2)+12x=9 by completing the square, add to both sides of the equation. (Simplify your answer. )

Answer 1

Add ((1/2)(12))² = 6² = 36 to both sides of this equation.

x² + 12x + 36 = 45

(x + 6)² = 45

x + 6 = ±3√5

x = -6 ± 3√5