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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 $
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