Evaluate: $(7 p + 3 z) (7 p - 3 z)$

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Solution

$(7 p + 3 z) (7 p - 3 z)$
$= 7 p (7 p - 3 z) + 3 z (7 p - 3 z)$
$= 49 p^{2} - 21 p z + 21 p z - 9 z^{2}$
$= 49 p^{2} - 9 z^{2}$

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