3ab^2+15a^2b^3+ 21a^3b^3
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we can take 3ab^2 as common
3ab^2 + 15a^2b^2 + 21a^3b^3
= 3ab^2 ( 1 + 5a + 7a^2b )
= 3ab^2 [ 1 + a ( 5 + 7ab )]
It is not factories further
3ab^2 + 15a^2b^2 + 21a^3b^3
= 3ab^2 ( 1 + 5a + 7a^2b )
= 3ab^2 [ 1 + a ( 5 + 7ab )]
It is not factories further
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