Question

a expressão (x³ + 1) x (x³ - 1) é igual a
a) x³ - 1
b) x⁹ - 1
c) x³ + 1

Answer 1

$\Large\boxed{\begin{array}{l}\sf(a+b)\cdot(a-b)=a^2-b^2\\\sf (x^3+1)\cdot(x^3-1)=(x^3)^2-1^2\\\sf (x^3+1)\cdot(x^3-1)=x^6-1\\\sf corrija~o~gabarito.\end{array}}$