Question

(x+2).(x-6)=0 com a conta montada

Answer 1

X²-6x+2x-12=0
X²-4x-12=0

16+48

Δ= 64 

4+-8/2

X'=4+8/2 =  12/2 =  6 

X''=-4/2  =  -2

S[6,-2]

Answer 2

x^2-6x+2x-12 x^2-4x-12=0 ∆=-4^2-4•1•(-12) ∆=16+48 ∆=64 X=-(-4)+/-√64 Tudo dividido por 2•1 X= 4+/-8 X'=4+8/2=6 X"=4-8/2=-2