Answer:
-3b^4 (6b^3 -b-5)
Explanation:
Each term is divisible by 3b^4 so we can factor this out
3b^5 + 15b^4-18b^7
3b^4( b+5 -6b^3)
Rewriting the inside term
3b^4 (-6b^3 +b+5)
We can factor out a negative
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