Question

Resolva a equação: 2x² = -12x - 18

Answer 1

2x²-18=0

2x² = 18

x² = 18 / 2

x² = 9

x = V9

x1 = 3

x2 = -3

Answer 2

$2x^2 = -12x - 18\\2x^2 + 12x + 18 = 0\\2(x^2 + 6x + 9) = 0\\x^2 + 6x + 9 = 0\\\\x = \frac{-6 \pm \sqrt{6^2 - 4.9.1} }{2.1}\\ x = \frac{-6 \pm \sqrt{36 - 36} }{2}\\ x = \frac{-6 \pm \sqrt{0} }{2}\\x = \frac{-6}{2}\\ x= - 3$