Question

resolva a equação do segundo grau X elevado a 2 + x - 7 = 5​

Answer 1

$x^2 + x - 7 = 5\\x^2 + x - 7 - 5 = 0\\x^2 + x - 12 = 0\\\\x = \frac{-1 \pm \sqrt{1^2 - 4.(-12).1}}{2.1}\\x = \frac{-1 \pm \sqrt{1 + 48}}{2}\\x = \frac{-1 \pm \sqrt{49}}{2}\\x = \frac{-1 \pm 7}{2}\\\\x_1 = \frac{-1 + 7}{2} = \frac{6}{2} = 3\\x_2 = \frac{-1 - 7}{2} = \frac{-8}{2} = -4$

Resposta: x = 3 ; -4