Question

me ajudem ! pra um trabalho

Answer 1

Letra C

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

Δ = $6^{2} -4*8$

Δ = $6^{2} -32$

Δ = $36-32$

Δ = $4$

$x_{1,2} = \frac{(-6)\± \sqrt{4} }{2}$

$x_{1,2} = \frac{(-6)\±2}{2}$

$x'=\frac{(-6)+2 }{2}$

$x'= \frac{-4}{2}$

$x'=-2$

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

$x''= \frac{-8}{2}$

$x''=-4$

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

Δ = $(-6)^{2} -4*(-1)(-8)$

Δ = $(-6)^{2} -32$

Δ = $36-32$

Δ = $4$

$x_{1,2} = \frac{6\± \sqrt{4} }{-2}$

$x_{1,2} = \frac{6\±2}{-2}$

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

$x'= \frac{8}{-2}$

$x'=-4$

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

$x''= \frac{4}{-2}$

$x''=-2$