Example 76

$\;\;\;(10 - p^{5}q^{4})^2$

$=(A - B)^2 \text{, where } A = 10 \text{ and } B = p^{5}q^{4} $

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

$=(10)^2 - 2(10)(p^{5}q^{4}) + (p^{5}q^{4})^2 $

$=100 - 20p^{5}q^{4} +p^{10}q^{8} $