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Factorise `12a^2 b + 15ab^2`

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Factorise `12a^2 b + 15ab^2`
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`12a^2b + 15ab^2`
`12a^2b = 2*2*3*a*a*b`
`15ab^2 = 3*5*a*b*b`
`=> 12a^2b + 15ab^2`
`= 2*2*3*a*a*b + 3*5*a*b*b`
`= 3ab[2*2*a + 5b]`
`= 3ab[4a+ 5b]`
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