Question

EFETUE AS SEGUINTES MULTIPLICAÇÕES :

A) (X+7) . ( X-1)

B) 2X . ( X² + 5X + 8 )

C) ( X³ + 8X² - 16X ) . ( -2X)​

Answer 1

Resposta:

ops!!!

Explicação passo a passo:

Answer 2

a)

$= (x + 7) \: . \: (x - 1)$

$= x \: . \: (x - 1) + 7(x - 1)$

$= x {}^{2} - x + 7x - 7$

$\boxed{ = x {}^{2} + 6x - 7}$

b)

$= 2x \: . \: (x {}^{2} + 5x + 8)$

$= 2x \: . \: x {}^{2} + 2x \: . \: 5x + 2x \: . \: 8$

$\boxed{ = 2x {}^{3} + 10x {}^{2} + 16x }$

c)

$= (x {}^{3} + 8x {}^{2} - 16x) \: . \: ( - 2x)$

$= - x {}^{3} \: . \: 2x - 8x {}^{2} \: . \: 2x - 16x \: . \: ( - 2x)$

$\boxed{ = - 2x {}^{4} - 16x {}^{3} + 32x {}^{2} }$

Att. YRZ