Simplify the expression.

(2k + 1) (k-4)

choices:

2k^2 - 7k + 4

2k^2 - 3k + 4

2k^2 + 9k + 4

2k^2 - 7k - 4

The answer is 2k^2 - 7k - 4 because 2k x k is 2k^2 and 2k x (-4) is - 8k and 1 x k is k and 1 x (-4) is - 4. So then you would get 2k^2 - 8k + k - 4 which simplifies to 2k^2 - 7k - 4 which is your answer.