Final answer to the problem
$3ab^2\left(a-10\right)$
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Step-by-step Solution
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1
Combining like terms $15ab^2$ and $-45ab^2$
$3a^2b^2-30ab^2$
2
Factor the polynomial $3a^2b^2-30ab^2$ by it's greatest common factor (GCF): $3ab^2$
$3ab^2\left(a-10\right)$
Final answer to the problem
$3ab^2\left(a-10\right)$