Question

$factorise \: using \: a {}^{2} - b {}^{2} = (a + b)(a - b) \\ 1. \: 32x {}^{2} {y}^{2} - 8$
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Answer 1

Answer:

$32x {}^{2} y {}^{2} - 8 \\ \\ = 2(16x {}^{2} y {}^{2} - 4) \: \: \: \: (2commun)\\ \\ = 2((4xy) {}^{2} - (2) {}^{2} ) \\ \\ = 2(4xy + 2)(4xy - 2) \\ \\ \\ formula \: \: - \: \: \: (x {}^{2} - y {}^{2} ) = (x + y)(x - y)$