Final answer:
The president's formal powers are listed in the Constitution, while informal powers are not.
Step-by-step explanation:
The difference between the president's formal and informal powers is that formal powers are listed in the Constitution while informal powers are not. Formal powers are the powers of the president that are explicitly stated in the Constitution, such as the power to veto legislation or the power to nominate Supreme Court justices.
Informal powers, on the other hand, are powers that emerge through tradition, and custom or are inherent in the office, such as the power of persuasion or the power of the 'bully pulpit' to influence public opinion.