Question

podem responder????!!!​

Answer 1

Explicação passo a passo:

A) A+C

Calculando:

$(6x^3+5x^3-8x+15) + (x^3+7x^2+9x+20)$

$6x^3+5x^3+x^3+7x^2-8x+9x+15+20$

$12x^3+7x^2+x+35$

B) B-C

$(2x^3-6x^3-9x+10)-(x^3+7x^3+9x+20)$

Calculando:

$2x^3-6x^3-9x+10-x^3-7x^3-9x-20$

$2x^3-6x^3-x^3-7x^3-9x-9x+10-20$

$-12x^3-18x-10$