Question

resolva a equação do segundo grau
(x-1) (X-2) - 12= 0

Answer 1

(x-1)(x-2)-12
x²-2x-x+2-12
x²-3x-10=0
∆=b²-4ac
∆=(-3)²-4.1.(-10)
∆=9+40
∆=49
x=-b±√∆/2a
x=-(-3)-7/2.1
x=3-7/2
x=-4/2
x=-2
x=-(-3)+7/2.1
x=3+7/2
x=10/2
x=5
S={(-2, 5)}