Question

(x+2).(x-1)=0 ????? Alguem Por Favor Mim Ajuda e Pra Amanha

Answer 1

(x+2).(x-1)=0
x^2-x+2x-2
x^2+x-2=0
delta=b^2-4ac
delta=1^2-4.1.(-2)
delta=1+8
delta=9
x=-b-/+ raiz de delta/2a
x=-1-3/2.1
x=-4/2
x=-2
x=-1+3/2.1
x=2/2
x=1
S={-2, 1}