Example 116

$\;\;\;(7p^{2} + 2)(7p^{2} - 2)$

$=(A + B)( A - B) \text{ , where } A = 7p^{2} \text{ and } B = 2 $

$=A^2-B^2$

$=(7p^{2})^2 - (2)^2 $

$=49p^{4} - 4 $