factorise 15ab+15+9b+25ab
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1) First REGROUPING
15ab+9b+25ab+15
2) Now FACTORISE
3b(5a+3)+5(5ab+3)
(3b+5)(5a+3)(5ab+3)
15ab+9b+25ab+15
2) Now FACTORISE
3b(5a+3)+5(5ab+3)
(3b+5)(5a+3)(5ab+3)
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