solve by completing the square:X^2+6x-12=0
x² + 6x -12 = 0x = -(6) +/- √((6)² - 4(1)(-12)) 2(1)x = -6 +/- √(36 + 48) 2x = -6 +/- √(84) 2x = -6 +/- 2√(21) 2x = -3 + √(21)x = -3 + √(21) x = -3 - √(21)
