SOLUTION: Factor 4b^7-500b^4 I have no clue

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Question 327832: Factor 4b^7-500b^4 I have no clue
Answer by romerr1(7) About Me  (Show Source):
You can put this solution on YOUR website!
4b^7 - 500b^4
1. GCF is 4b^4
= 4b^4(b^3 - 125)
2. Now you apply the factoring difference of two cubes:
a^3-b^3= (a-b)(a^2+ab+b^2)
= 4b^4(b-5)(b^2+5b+25)