Question

6
Resolvendo o produto abaixo,
encontramos: *
(1 Ponto)
(3x - 5). (4x2 - 2x + 8 )
12x3 + 26x2 + 34x - 40
12x3 - 26x2 - 34x - 40
12x3 - 26x2 + 34x + 40
12x3 + 26x2 + 34x + 40
12x3 - 26x2 + 34x - 40​

Answer 1

$\huge\boxed{\sf12x^3-26x^2+34x - 40}$

$\boxed{\begin{array}{lr}\\ (3x-5)(4x^2-2x+8)\\\\3x(4x^2-2x+8)\\\\12x^3-6x^2+24x-5(4x^2-2x+8)\\\\12x^3-6x^2+24-20x^2+10x-40\\\\12x^3-26x^2+24x+10x-40\\\\\boxed{12x^3-26x^2+34x - 40}\\\ \end{array}}$