Final answer:
The expression |ab| simplifies to ab when a > 0 and b > 0.
Step-by-step explanation:
To simplify the expression |ab| where a > 0 and b > 0, we need to understand the concept of absolute value. The absolute value of a number is its distance from zero on the number line. Since a and b are both positive, their absolute values will be equal to the numbers themselves. Therefore, |ab| simplifies to just ab.