Question

Se A = (x + 1) (x - 1) e B = (x + 2)(x - 2), então o valor de A + B é:

Answer 1

$A+B=(x+1)(x-1)+(x+2)(x-2)$

$A+B=(x^2-1)+(x^2-4)$

$A+B=x^2-1+x^2-4$

$A+B=2x^2-5$