Question

$(9xy + 2z)(9xy - 2z)$

Answer 1

$(9xy + 2z) \: (9xy - 2z) \\ by \: using \: identity \: \: (a + b) \: \: (a - b) = {a}^{2} - {b}^{2} \\ \\ = > ( {9xy)}^{2} - ( {2z)}^{2} \\ = > \: {81x^2y}^{2} - {4z}^{2}$
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Answer 2

$Heya \: User !!$

$Here \: Is \: Ur \: Solution.....$

$Question -:$

$(9xy + 2z) (9xy - 2z)$

$It \: is \: in \: the \: form \: of \: (a+b) (a-b)...$

$So \: its \: formula \: is \: a ^2 - b ^2$
.
$= (9xy) ^2 - (2z) ^2$

$= 81x ^2y^2 - 4z ^2$

$Thankuu....$

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