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## Homework Statement

Determine whether the integral is divergent or convergent. If it is convergent, evaluate it. If not, give the answer -1. :

Integral from 6 to infinity x(e^(-3x))dx

## Homework Equations

## The Attempt at a Solution

In this case, i first made the limit as t goes to infinity Integral from 6 to t x(e^(-3x))dx and then i did a u sub (u=-3x and du/-3=dx) but when i tried to replace x in the original equation which i thought would be x=u/-3. From there, i replaced the values and solved it but it's wrong...and i know for sure that's its convergent but i don't know where i'm going wrong... thanks