ab+23b²

The expression you've provided is \( ab + 23b^2 \). This is a polynomial in two variables, \( a \) and \( b \).

If you are looking to factor it, we can factor out \( b \):

\[ b(a + 23b) \]

If you're looking for something specific to do with this expression—like evaluating it for specific values of \( a \) and \( b \), differentiating it, or anything else—please provide more context!