# Math Help - Integral problem/find constant

1. ## Integral problem/find constant

I'm not exactly sure what this is asking. Help with explanation would be great, thanks.

2. I would move terms around:

$K = \int_{b}^{x} f(t)dt - \int_{a}^{x} f(t)dt$

Now just compute these integrals and you've found $K!$