Evaluate the expression: ab when a=-5 and b=10

(USA)

Question

Evaluate ab when a=-5 and b=10.

Answer

First, we must know that ab is the same as:
Now, since a is given as -5, we can substitute a with -5. This is shown below:Similarly, b is given as 10. So, we can substitute b with 10:With this, we can now evaluate ab as shown below:You can learn more about evaluating expression here.