Let
f(x) = \begin{cases}
{3}x, & x \leq 3, \\
x^2, & x > 3.
\end{cases}

Find each point of discontinuity of

** NOTE: **
When using interval notation in WeBWorK, remember
that:

You use 'INF' for

If you have more than one point, give them in
numerical order, from smallest to largest.

If you have extra boxes, fill each in with an 'x'.

Point 1:

Point 2:

Point 3:

You can earn partial credit on this problem.