Question

a
$a ^{4} b ^{4} - 81c ^{4}$
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Answer 1

Answer:

$a {}^{4} b {}^{4} - 81c {}^{4} \\ = (a {}^{2}b {}^{2} ) {}^{2} - (9c {}^{2} ) {}^{2} \\ = (a {}^{2}b {}^{2} + 9c {}^{2})(a {}^{2} b {}^{2} - 9c {}^{2} ) \\ = (a {}^{2}b {}^{2} + 9c {}^{2} )(ab + 3c)(ab - 3c)$

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