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We can combine the like terms. So the b2 can be combined with the 2b2 to give 3b2. Likewise the 3b plus the -5b gives -2b.

Therefore, b2 + 3b - 5b + 2b2 = 3b2 - 2b.

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Q: What is b2 plus 3b-5b plus 2b2?
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