Question

8– Dados os polinômios: A = 2x³ + 4x + 2 e B = – x³ + x – 3. Efetue:

a) A + B;

b) A – B;

c) B – A.


por favor me ajude e par hoje dou 40 pontos​

Answer 1

Oie, Td Bom?!

a)

$= A + B$

$= (2x {}^{3} + 4x + 2) + ( - x {}^{3} + x - 3)$

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

$= x {}^{3} + 5x - 1$

b)

$= A - B$

$= (2x {}^{3} + 4x + 2) - ( - x {}^{3} + x - 3)$

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

$= 3x {}^{3} + 3x + 5$

c)

$= B- A$

$= ( - x {}^{3} + x - 3) - (2x {}^{3} + 4x + 2)$

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

$= - 3x {}^{3} - 3x - 5$

Att. Makaveli1996