Given the problem find $F'(x)$:
$ \int_x^{x+2} (4t+1) \ \mathrm{dt}$
I just feel stuck and don't know where to go with this, we learned the second fundamental theorem of calculus today but i don't know where to plug it in. What i did:
- chain rule doesn't really take into effect here(*1) so just replace t with $x$
- $F'(x) = 4x + 1$
though the answer is just 8, what am i doing wrong?