Multiply Polynomials

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Multiply $(l-1)(l+8)$

**Answer**

$\;\;\; (l-1)(l+8)$

$=l(l+8)-1(l+8)$

$=l^{2}+8l-l-8$

$=(l^{2})+(8l-l)+(-8)$

$=l^{2}+7l-8$