improper integral involving e

See attachment.

You can find using integration by parts.

Do you know this method?

Quote:

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Originally Posted by pickslides

You can find using integration by parts.

Do you know this method?

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yah its like uv- integral of vdu

so is it xe^x - e^x ?

Quote:

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Originally Posted by WartonMorton

yah its like uv- integral of vdu

so is it xe^x - e^x ?

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Sounds good.

so thus the improper integral is -1 ?

That's what I get.