FOIL Method

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Multiply and simplify (if possible) $(5k +7l)(2k +l)$

**Answer**

$\;\;\;(5k +7l)(2k +l)$

$=(5k)(2k) + (5k)(l) + (7l)(2k) + (7l)(l)$

$= 10k^{2} +5kl +14kl +7l^{2} $

$= 10k^{2} +19kl +7l^{2} $