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Factorize :27a³ + 125b³...

Factorize :27a³ + 125b³

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`27a³ + 125b³= (3a)³ + (5b)³`
This of the form `a³ + b³ = (a + b)(a² - ab + b²)`
`(3a)³ + (5b)³`
=` (3a + 5b) [(3a)² - (3a)(5b) + (5b)²]`
=` (3a + 5b) (9a² - 15ab + 25b²)`
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