Example 120

$\;\;\;(1 + 9u^{5}v^{8})(1 - 9u^{5}v^{8})$

$=(A + B)( A - B) \text{ , where } A = 1 \text{ and } B = 9u^{5}v^{8} $

$=A^2-B^2$

$=(1)^2 - (9u^{5}v^{8})^2 $

$=1 - 81u^{10}v^{16} $