I'm working through Algebra 2 on Khan Academy, and I've come across an example that simplifies $\frac{6x^3 + 2x^2}{10x^2}$ as $\frac{3x +1}{5}$ and then states that 'even in the simplified form, it is clear that $x = 0$ is the only value for which the expression is undefined'.
I'm a little lost on how this is evident in the simplified form, as I would have thought $x = 0$ would evaluate to $0.2$. Can anyone explain?