Final answer:
The area of a square with sides of length 5ab is 25a^2b^2.
Step-by-step explanation:
To express the area of a square with sides of length 5ab as a monomial, we need to use the formula for the area of a square, which is side length squared. In this case, the side length is 5ab, so the area is (5ab)^2. Simplifying this expression, we have 25a^2b^2 as the monomial to represent the area of the square.
Learn more about Area of a square