Question

factorise
a^3 b^3 - 9а^2 b^2 + 20 аb​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Step-by-step explanation:

$= > ab( {a}^{2} {b}^{2} - 9ab + 20) \\ = > {a}^{2} {b}^{2} - 5ab - 4ab + 20 \\ = > ab(ab - 5) - 4(ab - 5) \\ = > (ab - 5)(ab - 4)$