algebra

2b*b=?
Well 2b means that there are two B's. If you add another "B" to it, then how many B's would you have? You would have three B's. So 2b*b= 3b.

Our guest is correct.
If you have 2 b's and you ADD 1 b you do get 2b+1b = 3b
BUT
your question is multiply NOT add

2b*b = 2*b*b= 2*b^2 = 2b^2 that is, 2bsquared