The syntax error is caused by the 3e. In Prime, digits followed by "e" must be followed by more digits, forming a number in scientific notation. If you want 3*e^(3*q) then you must include the multiplication symbol ( * ) between the 3 and the e. In general, to avoid ambiguous inputs, never use implied multiplication on the HP Prime.
Hope that helps! Disclaimer: I don't work for HP, but HP calculators work for me.