Question

faça a eq de x2 +2x -8=0?​

Answer 1

Bom Dia !!!

Coeficientes :

a = 1

b = 2

c = -8

Δ = b² - 4.a.c

Δ = 2² - 4.1.(-8)

Δ = 4 + 32

Δ = 36

$x = \frac{-b\pm\sqrt{\Delta} }{2.a}\\\\x = \frac{-2\pm6}{2} \\\\x' = \frac{4}{2}\\\\x' = 2\\\\x" = \frac{-8}{2} \\\\x" = 4\\\\s = [2, 4]$

Espero ter ajudado :-)

Att: LDC