How do you simplify $-y^3-6y(y^2-y)$ ?

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Answer 1 · 2016-04-13T06:53:33

$= - 7y^3 + 6y^2$

$- y ^3 - color(green)(6y) * ( y ^2 - y)$
$= - y ^3 + color(green)( (- 6y)) * ( y ^2 ) + color(green)( (- 6y)) * (- y)$

$= - y ^3 - 6y^3 + 6y^2$

$= - 7y^3 + 6y^2$

How do you simplify -y^3-6y(y^2-y)-y^3-6y(y^2-y)?