Question

sendo ab=6 e b2+7b=20, calcule o valor de ab3+7ab2-3ab

Answer 1

Olá

ab = 6

$ab^{3} + 7ab^{2} - 3ab$

$6^{3} + 7 . 6^{2} - 3 . 6$
$216 + (7 . 36) - 18$

$216 + 252 - 18$
468 - 18
450

Resposta:
$S = {450}$