Special Products Rule 2

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Expand $(p - q)^2$

**Answer**

$\;\;\;(p - q)^2$

$=(A - B)^2 \text{, where } A = p \text{ and } B = q $

$=A^2 - 2AB + B^2$

$=(p)^2 - 2(p)(q) + (q)^2 $

$=p^{2} - 2pq +q^{2} $