Question

me ajuda por favor
como eu faço essa conta

Answer 1

$\text A = \text x^5-8 \ \ \text e \ \ \text B = -4\text x^5+3\text x^3+9 \ . \ \ \\\\ \text {A.B} = \ ? \\\\ \text{S{\'o} multiplicar membro a membro, assim}: \\\\ (\text x^5-8)(-4\text x^5+3\text x^3+9) \\\\ \text x^5(-4\text x^{5}) +\text x^5.3\text x^3+9\text x^5 +(-8)(-4\text x^5)+(-8).3\text x^3+(-8).9 \\\\ -4\text x^{10}+3\text x^8+9\text x^5+32\text x^5-24\text x^3-72 \\\\ \huge\boxed{-4\text x^{10}+3\text x^8+41\text x^5-24\text x^3-72 \ }\checkmark$

letra C