Question

Solve by factoring.

x2 + 6x = - 9. Hint: This is a double root.

Answer 1

x^2 + 6x = -9
( x + 3)^2 - 9 = -9
(x + 3)^2 = -9 + 9 = 0

x + 3 = 0

x = -3 ( double root)