Question

Multiplicando (2x² + x + 1)(5x – 2), teremos: a) 10x³+ x² + 3x – 2 b) -10x³+ x² + 3x – 2 c) 10x³- x² + 3x – 2 d) 10x³+ x² + 3x – 5

Answer 1

Oie, Td Bom?!

■ Resposta: Opção A.

$= (2x {}^{2} + x + 1) \: . \: (5x - 2)$

$= 2x {}^{2} \: . \: (5x - 2) + x \: . \: (5x - 2) + 4(5x - 2)$

$= 10 x{}^{3} - 4x {}^{2} + 5x {}^{2} - 2x + 5x - 2$

$= 10x {}^{3} + x {}^{2} + 3x - 2$

Att. Makaveli1996