Question

X ao quadrado menos 2X - 2 = 0

Answer 1

x²-2x-2=0
a=1
b=-2
c=-2

Δ=b²-4.a.c
Δ=(-2)²-4.1.(-2)
Δ=4+8
Δ=12

x'=b+√Δ/2.a 
x'=-2+3,46/2.1
x'=1,46/2 = 0.73

x''=b-√Δ/2.a
x''=-2-3,46/2
x''=-5,46/2 
x''=2,73