Question

calcule os produtos de:
a) (5x²-2) (x+1)
b) y(y^5+3xy³)
c)-xy(x²=2xy=y²)

Answer 1

a) (5x² - 2) . (x + 1)

5x² . x + 5x². 1 - 2.x - 2.1
=> 5x³  + 5x² - 2x - 2

===
b) y.(y⁵ + 3xy³)

y.y⁵ + y . 3xy³
=> y⁶ + 3xy⁴

===
c) - xy . (x² - 2xy + y²)

-xy . x² + xy.2xy -xy . y²

=> -x³y + 2x²y² - xy³