Question

resolva as equação usando a fórmula de bascara x(x-2)=2 (x+6)

Answer 1

x(x-2)=2(x+6)
x²-2x=2x+12
x²-2x-2x-12=0
x²-4x-12=0
a=1
b=-4
c=-12
x=-b±√∆/2a
∆=(-4)²-4*1*(-12)
∆=16+48
∆=64
∆=8
x=-(-4)±8/2
x=4±8/2
x1=4-8/2
x1=-4/2
x1=-2

x2=4+8/2
x2=12/2
x2=6

S={-2,6}