Question

Se  A=x³-6 e B=x³+6  então A+B é igual a ??

Answer 1

$A=x^{3}-6\\B=x^{3}+6$

$A+B=(x^{3}-6)+(x^{3}+6)\\A+B=x^{3}-6+x^{3}+6\\A+B=x^{3}+x^{3}+6-6\\A+B=2x^{3}$

Answer 2

 A=x³-6 e B=x³+6  

A + B = 
(x³-6) + (x³+6) =
x³ - 6 + x³ + 6 = 2x³