- #1

- 52

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Integral of e to the -2x times x squared dx

it expands to 1/4, but I'm not sure how to start.

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- Thread starter casanova2528
- Start date

- #1

- 52

- 0

Integral of e to the -2x times x squared dx

it expands to 1/4, but I'm not sure how to start.

- #2

Hootenanny

Staff Emeritus

Science Advisor

Gold Member

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Hey

Integral of e to the -2x times x squared dx

it expands to 1/4, but I'm not sure how to start.

You don't really need a Taylor expansion here, how about trying a substitution?

- #3

- 52

- 0

I've already tried substitution.

argh!

i've tried u = e ^ -2x

I've also tried u = x squared.

it doesn't work!!!!

HELP!

- #4

- 199

- 0

Integrate by parts and it works.

- #5

- 52

- 0

with what do I start?

- #6

rock.freak667

Homework Helper

- 6,223

- 31

with what do I start?

you start by integrating

[tex]\int xe^{-2x}dx[/tex]

by parts.

- #7

- 287

- 0

u = x^2

du = 2x dx

dv = e^-2x dx

v = -1/2 e^-2x

Give it a shot from there.

- #8

- 52

- 0

i get it now....just needed a refresher....thanks a lot!

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