Question

add or subtract the polynomials. 8. (-3a³ + 2a² - 4) + (a³ - 3a² - 5a + 7)

Explanation:

Step1: Eliminar paréntesis

$(-3a^{3}+2a^{2}-4)+(a^{3}-3a^{2}-5a + 7)=-3a^{3}+2a^{2}-4+a^{3}-3a^{2}-5a + 7$

Step2: Combinar términos semejantes

$(-3a^{3}+a^{3})+(2a^{2}-3a^{2})-5a+( - 4 + 7)$
$=-2a^{3}-a^{2}-5a + 3$

Answer:

$-2a^{3}-a^{2}-5a + 3$