Multiply Polynomials

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Multiply $(5r+9)(r+1)$

**Answer**

$\;\;\; (5r+9)(r+1)$

$=5r(r+1)+9(r+1)$

$=5r^{2}+5r+9r+9$

$=(5r^{2})+(5r+9r)+(9)$

$=5r^{2}+14r+9$