Question

7- Encontre as raízes da equação x²+2x -8 = 0 *

Answer 1

x² + 2x - 8 = 0

∆ = 2² - 4.1.(-8)

∆ = 4 + 32

∆ = 36

$x = \frac{ - 2 + - \sqrt{36} }{2 \times 1}$

$x = \frac{ - 2 + - 6}{2}$

${x}^{1} = \frac{ - 2 - 6}{2} \\ {x}^{2} = \frac{ - 2 + 6}{2}$

${x}^{1} = - 4 \\ {x}^{2} = 2$