Example 108

$\;\;\;(u^{2}v^{3} + 5)(u^{2}v^{3} - 5)$

$=(A + B)( A - B) \text{ , where } A = u^{2}v^{3} \text{ and } B = 5 $

$=A^2-B^2$

$=(u^{2}v^{3})^2 - (5)^2 $

$=u^{4}v^{6} - 25 $