# Thread: Is this integral correct?

1. ## Is this integral correct?

f (0.88 + 8.965e^-1.44V)

= (0.88V + ((8.965e^-1.44V)/-1.44)

and

f(0.575+5.79e^-0.29V)

= 0.575V + ((5.79e^-0.29V)/-0.29)

2. Would anyone be able to help me quickly? It's the first one that I think is wrong.

3. Hello,
Originally Posted by zapparage
f (0.88 + 8.965e^-1.44V)

= (0.88V + ((8.965e^-1.44V)/-1.44)

and

f(0.575+5.79e^-0.29V)

= 0.575V + ((5.79e^-0.29V)/-0.29)

$\int 0.88+8.965\exp(-1.44V)\,\mathrm{d}V$ and $\int 0.575+5.79\exp(-0.29V)\,\mathrm{d}V$

then there is only one thing which is wrong in your work: you forgot to add a constant to each result.

4. As in V, or C?

Will that matter in this:

5. Originally Posted by zapparage
As in V, or C?
In this case $V$ is a variable, not a constant. For the first integral, you should have written

$\int 0.88+8.965\exp(-1.44V)\,\mathrm{d}V=0.88V-\frac{8.965}{1.44}\exp(-1.44V)+C$

where $C$ is a constant.

Will that matter in this:
No it doesn't matter since you're computing a definite integral.