Multiply Polynomials

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Multiply $(9r+4)(7r+5)$

**Answer**

$\;\;\; (9r+4)(7r+5)$

$=9r(7r+5)+4(7r+5)$

$=63r^{2}+45r+28r+20$

$=(63r^{2})+(45r+28r)+(20)$

$=63r^{2}+73r+20$