Question

Simplify the rational expression.  State any restrictions on the variable.

Answer 1

The last choice.

Explanation:

`(k^2-k-2)/(k^2-4k-5)=((k+1)(k-2))/((k+1)(k-5))=(k-2)/(k-5)`

The value of k must be restricted from being one that makes the original denominator zero. Hence k ≠ -1 or 5.