Question

(x+2).(x-4)=0 me ajudem​

Answer 1

(x+2)•(x-4)=0
x²-4x+2x-8=0
x²-2x-8=0
x=[-(-2) ±√((-2)²-4•1•(-8))]/2•1
x=[2 ±√(4+32)]/2
x=(2 ±6)/2
x’=4
x”=-2