# Integration-very simpleneed help fast!

1. Feb 1, 2008

### pinkyjoshi65

integration---very simple..need help fast!

how to integrate 6e^-2t

2. Feb 1, 2008

### Ben Niehoff

Yes, it is very simple. What's confusing you about it, exactly?

3. Feb 1, 2008

### pinkyjoshi65

dont know how to do it..lyke integal of it is 6*-0.5*e^-2t?

4. Feb 1, 2008

### Feldoh

Looks right...

5. Feb 1, 2008

### pinkyjoshi65

so now suppose i want to put in values for t as 0 and 6..will i get the answer as 2.99?

6. Feb 1, 2008

### Ben Niehoff

No, not at all.

Edit: No, wait, maybe. I read it wrong. I assume you know how to use a calculator, though...I don't see what you're asking help with anymore.

7. Feb 1, 2008

(e^-2t)/-3

8. Feb 1, 2008

### Feldoh

Yes you will get something like 2.99998

Huh?

9. Feb 1, 2008

### transgalactic

aaahhh sorryy its
-3*(e^-2t)

10. Feb 2, 2008

### fermio

$$\int 6e^{-2x}dx=6\int e^{-2x}\frac{d(-2x)}{-2}=-3\int e^{-2x}d(-2x)=-3 e^{-2x}+C$$
where $$d(-2x)=-2dx$$
$$dx=\frac{d(-2x)}{-2}$$