Question

Which is the value of this expression when a =5 and k=2?

Answer 1

just substitute 5 into a and -2 into k

Answer 2

Answer: The answer to this question would be 25/9 in exact form, 2.7 repeating in decimal form, or 2 and 7/9 as a mixed number.  To solve all you would need to do is substitute the values of the variables into the expression and then simplify.