1.

If int_(0)^(oo)e^(-ax)dx=(1)/(a), then value of int_(0)^(oo)x^(m)e^(-ax)dx equals

Answer»

`((-1)^(m)m!)/(a^(m+1))`
`((-1)^(m)(m-1))/(a^(m))`
`(m!)/(a^(m))`
`(m!)/(a^(m+1))`

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