Answer
$ 2a^2b+ab^2$
Work Step by Step
We are asked to combine like terms, so, in this exercise, we add the two like terms, which are the first and the last terms:
$=2a^2b + (-2ab^2+3ab^2)\\
=2a^2b+(-2+3)ab^2\\
=2a^2b+1(ab^2)\\
=2a^2b+ab^2$