Simplify the expression using the properties of exponents. Expand any numerical portion of your answer and only include positive exponents.

5(a^−1b)

5(a^−1b) can be simplified using the property of exponents which states that a^(-1) is equal to 1/a.

Applying this property, the expression becomes:

5(1/a * b)

Multiplying the terms inside the parentheses, the expression further simplifies to:

5b/a

This can be expanded as:

5b / a