Hi,
Well you could say the first one is a feature, the second one is certainly no bug…
Just try this in normal latex, and you will see that the first one (missing the * operator) is really some service to lazy teachers.
Use texmath on the equations and all your « bugs » are gone
\text{f1 = texmath(-8*x^2+112*x-392)}
Another thing: use the separator « & » when using multicol array
\begin{array}{lclr}
c1 & c2 & c3 & c4 \\
c11 & c22 & c33 & c44 \\
c111 & c222 & c333 & c444
\end{array}
Joke
