Question

X elevado a dois mais 6x mais 8 =o

Answer 1

D:b-4.a.c
D:6-4.1.8
D:36-32
D√:4
 : raiz de 4 : +-2
x=-b +-√ D  /2.a
x=-6 +- √4  /2.1
x=-6 +-2 /2   
x¹= -6 +2 /2 = 4
x²= -6 -2 /2 = 2
x¹ = -4 
x² = -2

Answer 2

X^2 + 6x + 8 = 0
(X + 2)(X + 4) = 0

X+2= 0. X+4 = 0

X = -2, X = -4