Question

factorise
9x^2y^2 -16
please help me
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Answer 1

Solution↷

$9x^2y^2 -16 \\ \implies \: (3xy) {}^{2} - (4) {}^{2} \\ [a {}^{2} - {b}^{2} = (a - b)(a + b)]\\ \green{ \implies \: (3xy - 4)(3xy + 4)}$