Answer:
The Implied power of the congress is based/inferred in the end of article 1 section 8, it is not explicitly stated but it is known as an "elastic clause".
Explanation:
It is called an elastic clause because it stretches the congress powers(authority). therefore giving the congress Implied power. Example of such Implied power is : The establishment of banks by congress to enable them carry out their constitutional requirement (congress power) of collecting taxes. an elastic clause is known as a necessary and proper clause