Question

x²-6x-8=0 alguém sabe resolve

Answer 1

$x^{2}$ - 6x - 8 = 0

Δ =$(-6)^{2}$ - 4 (-8)
Δ = $(-6)^{2}$ + 32
Δ = 36 + 32
Δ = 68

$x_{1,2}$ = 6 + √68 /2a
                                   -

$x_{1}$ = $\frac{ 6 + 8,246}{2}$

$x_{1}$ = $\frac{14,246}{2}$

$x_{1}$ = $\frac{1}{0,14}$


$x_{2}$ = $\frac{6 - 8,246}{2}$

$x_{2}$ = $\frac{-2,246}{2}$

$x_{2}$ = $\frac{1}{-0,89}$




                                 

Answer 2

a=1
b=-6
c=-8
-b dividido por a =-6
c dividido por a=-8