Final answer:
The statement is false as the correct term for powers shared by the state and the national government is concurrent powers, not expressed powers.
Step-by-step explanation:
The statement that powers shared by both the state and the national government are called expressed powers is false. The correct term for these shared powers is concurrent powers. Expressed/enumerated powers are specifically listed in the Constitution and are granted exclusively to the national government. These include the power to declare war, impose taxes, and regulate interstate commerce. On the other hand, concurrent powers include those which both the federal government and the states can exercise, such as the power to levy taxes. Reserved powers are those not expressly given to the national government and are intended to be exercised by the states. Also, the necessary and proper clause has the effect of expanding the power of the national government, not limiting it, making the statement in Exercise 9.3.1 false.