Question

$ab( {a}^{2} - {b}^{2}$
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Answer 1

Factorising -

$ab \: (a {}^{2} - b ^{2} )$

$using \: identity \: - \\ a {}^{2} - b {}^{2} = (a + b)(a - b)$

$ab \: (a + b)(a - b)$

Hope it helps !