FOIL Method

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Multiply and simplify (if possible) $(5k +l)(3k +8l)$

**Answer**

$\;\;\;(5k +l)(3k +8l)$

$=(5k)(3k) + (5k)(8l) + (l)(3k) + (l)(8l)$

$= 15k^{2} +40kl +3kl +8l^{2} $

$= 15k^{2} +43kl +8l^{2} $