Special Products Rule 3

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Expand $(a + b)(a - b)$

**Answer**

$\;\;\;(a + b)(a - b)$

$=(A + B)( A - B) \text{ , where } A = a \text{ and } B = b $

$=A^2-B^2$

$=(a)^2 - (b)^2 $

$=a^{2} - b^{2} $