Question

please factorise this math

Answer 1

$\: \: \: \: ( {a}^{2} - 5 {a}^{2}) - 36 \\ = ( - 4 {a}^{2}) - 36 \\ = 16 {a}^{2} - 36 \\ = (4a + 6)(4a - 6).$



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