Question

considere os polinomiôs A = 6x² - 8x + 1 , B = - 9x² -2x +7 e C = 7x³+ X², calcule C-B+A, marque a opção que corresponde a resposta certa

(A) 7x² - 6x + x - 1

(B) 7x³ + 16x² - 6x - 6

(C) 7x³ - 16x² + 6x + 6

(D) 7x³ + 16x² - 6x - 6​

Answer 1

A = 6x² - 8x + 1  

B = - 9x² - 2x + 7  

C = 7x³+ X²

C - B + A

(7x³+ X²) - (- 9x² - 2x + 7 ) + (6x² - 8x + 1)

7x³ + x² + 9x² + 6x² + 2x - 8x - 7 + 1

7x³ + 16x² - 6x - 6

Alternativa (D) 7x³ + 16x² - 6x - 6​

Answer 2

Resposta:

$\textsf{Leia abaixo}$

Explicação passo a passo:

$\mathsf{A = 6x^2 - 8x + 1}$

$\mathsf{B = -9x^2 - 2x + 7}$

$\mathsf{C = -7x^3 + x^2}$

$\mathsf{C - B = (7x^3 + x^2) - (-9x^2 - 2x + 7)}$

$\mathsf{C - B = 7x^3 + x^2 + 9x^2 + 2x - 7}$

$\mathsf{C - B = 7x^3 + 10x^2 + 2x - 7}$

$\mathsf{C - B + A = (7x^3 + 10x^2 + 2x - 7) + (6x^2 - 8x + 1)}$

$\boxed{\boxed{\mathsf{C - B + A = 7x^3 + 16x^2 - 6x - 6}}}\leftarrow\textsf{letra D}$