Solve by completing the square:X^2+6x-12=0

X² + 6x - 12 = 0

x = - (6) + / - √ ((6) ² - 4 (1) (-12))

2 (1)

x = - 6 + / - √ (36 + 48)

2

x = - 6 + / - √ (84)

2

x = - 6 + / - 2√ (21)

2

x = - 3 + √ (21)

x = - 3 + √ (21) x = - 3 - √ (21)