Question

Se A= (x+1)² + (x-1) (x+1) e B= -2x (x+1), Calcule A+B

Answer 1

$A=x^2+2x+1+x^2-1=2x^2+2x\\ \\ B=-2x^2-2x\\ \\ A+B=2x^2+2x-2x^2-2x=0$

Answer 2

A=x²+2x+1+x²-1                  B=-2x²-2x

A=2x²+2x

A + B=2x²+2x -2x²-2x

A+B=0