Question

qual e essa equaçao (x+1)²+(x-1)²

Answer 1

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

(x+1)²+(x-1)² = (x.x + x.1 + 1.x + 1.1) + (x.x - x.1 - 1.x + 1.1)

(x+1)²+(x-1)² = x²+2x+1 + x²-2x+1

(x+1)²+(x-1)² = 2x²+2