# MATH

what is the integration of x . e ^(-x) ?
Can you please explain it :)

Thanks

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1. as you know, the derivative of e^u = e^u u'

So, ∫e^u du = e^u

Here, u = -x, so du = -dx

You thus have

∫e^u (-du) = -∫e^u du = -e^u = -e^-x

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posted by Steve

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