Question

factorization using identities​

Answer 1

Answer:

$63 {x}^{2} {y}^{2} - 7 \\ = 7(9 {x}^{2} {y}^{2} - 1) \\ = 7({(3xy)}^{2} - 1^{2}) \\ =7(3xy+1)(3xy-1)$

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