To express the polynomial 6p^2 + 2p^3 − p^4 + 3 in standard form, which term should be written first?

The term with the highest power comes first, in this case, p to the 4th power is the highest, then p to the 3rd, then p to the 2nd, the constant is p to the zeroth power, so it stays at the end.
the answer is -p^4