Question

Resolva a equação do segundo grau:

x2 + 6x + 8 = 0

Answer 1

a= 1 b=6 c=8
6.6 - 4.1.8
36 - 32
4

x = -6 +/- raiz de 4/2.1
x' = -6 + 2 ÷ 2 | x' = -2
x" = -6 -2 ÷ 2 | x" = -4

Answer 2

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

$a=1$

$b=6$

$c=8$

Δ=$b^{2} -4(a.c)$

Δ=$(6)^{2} -4(1.8)$

Δ=$36-32$

Δ=$4$

$x1=\frac{-b+\sqrt{4}}{2.a}=\frac{-6+\sqrt{4}}{2.1}=\frac{-6+2}{2}=-\frac{4}{2}=-2$

$x2=\frac{-b-\sqrt{4}}{2.a}=\frac{-6-2}{2.1}=-\frac{8}{2}=-4$