Factor polynomial $$ x^{3}+6x^{2}-15x-90 $$
Answer
$$ x^{3}+6x^{2}-15x-90 = ( x^{2}-15 )( x+6 ) $$
Explanation
To factor $ x^{3}+6x^{2}-15x-90 $ we can use factoring by grouping:
Group $ \color{blue}{ x^{3} }$ with $ \color{blue}{ 6x^{2} }$ and $ \color{red}{ -15x }$ with $ \color{red}{ -90 }$ then factor each group.
$$ \begin{aligned} x^{3}+6x^{2}-15x-90 = ( \color{blue}{ x^{3}+6x^{2} } ) + ( \color{red}{ -15x-90 }) &= \\ &= \color{blue}{ x^{2}( x+6 )} + \color{red}{ -15( x+6 ) } = \\ &= (x^{2}-15)(x+6) \end{aligned} $$This page was created using
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