Posted by **Lilian** on Friday, April 2, 2010 at 5:58pm.

Can you please tell me step by step on how to do this problem. Factoring by grouping:

ab-5a-15+3b

Thank You

- Math -
**bobpursley**, Friday, April 2, 2010 at 6:41pm
a(b-5)+3(b-5)

(a+3)(b-5)

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