(k+1)(K-5)
Expand the following: (k + 1) (k - 5)
(k + 1) (k - 5) = (k) (k) + (k) (-5) + (1) (k) + (1) (-5): k k + k - 5 k - 5
k k = k^2: k^2 + k - 5 k - 5
k - 5 k = -4 k: Answer: k^2 - 4k - 5