How do you multiply $3xy(-x^4-4x^2 y+5xy^2)$ ?

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Answer 1 · 2015-06-26T14:07:14

$= color(blue)(-3x^5y - 12x^3.y^2 + 15x^2y^3$

$color(blue)(3xy)(-x^4-4x^2y+5xy^2)$
$=color(blue)(3xy) . (-x^4) + color(blue)(3xy) . (-4x^2y) + color(blue)(3xy) . (5xy^2)$

$= color(blue)(-3x^5y - 12x^3.y^2 + 15x^2y^3$

How do you multiply 3xy(-x^4-4x^2 y+5xy^2) 3xy(-x^4-4x^2 y+5xy^2) ?