Answer:
15b (b+1) (b-1)
Step-by-step explanation:
15b^3-15b
15b^2 b - 15b
15b ( b^2 - 1)
Factor b^2 ( b+1) (b - 1)
b^2 -1
b^2 -1^2
= ( b + 1 ) ( b - 1 )
Answer = 15b ( b + 1 ) ( b - 1 )
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