Take the derivative of $\displaystyle 5x^2e^3x$
I got $\displaystyle 10xe^3x(2x+3)$ The X afeter the 3 are suppose to be with the 3 and not lower then the 3.
If you have more than one character in an exponent, set off the whole exponent in braces.
[tex]x^{3x}[/tex] gives $\displaystyle x^{3x} $ instead of $\displaystyle x^3x$.