Answer:
3b^2.
Explanation:
The GCF of 12 and 15 is 3, and
the GCF of b^2 and b^3 is b^2.
Answer is 3b^2.
3b^2
12b^2=3 b^2 *4
15b^3=3*5*b^2*b
the greatest common factor is 3b^2
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