Question

Calcule as multiplicações dos polinômios :A: x-(3x² - 1) =
B: (-5a) . (x-a2) =
C: (a - 2x) . (3a + 5x - y) =

Answer 1

$a)~~~x-(3x^2-1)\to~~ x-3x^2+1\to~~ \boxed{-3x^2+x+1}\\\\\\\\ b)~~~ (-5a)(x-a^2)\to~~ -5ax+5a^3\to~~ \boxed{5a^3-5ax}\\\\\\\\ c)~~~(a-2x)(3a+5x-y)\to~~ 3a^2+5ax-ay-6ax-10x^2+2xy\to\\ \\ \boxed{3a^2-10x^2-5ax-ay+2xy}$