Question

qual a resposta (x-1)²+(x+2)²

Answer 1

(x-1)²+(x+2)²

(x-1).(x-1)+(x+2).(x+2)

x²-x-x-2+x²+2x+2x+4=0

2x²+4x=-4+2

2x²+4x+2=0

Δ=(-4)²-2.4.2

Δ=16-16

Δ=0

-4+/-√0 sobre 2.2 →    -4/4=-1

x=-1