Special Products Rule 3

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Expand $(7k + l)(7k - l)$

**Answer**

$\;\;\;(7k + l)(7k - l)$

$=(A + B)( A - B) \text{ , where } A = 7k \text{ and } B = l $

$=A^2-B^2$

$=(7k)^2 - (l)^2 $

$=49k^{2} - l^{2} $