Please show EVERY step in integrating ((x-1)^2)*(e^-x)dx from 0 to infinity. In particular, when I consult other solutions and Wolfram Alpha, none explain what happens to the second (the 'x') expanded term, with the 2 constant. I keep getting 0 as a final answer but the answer is somehow 1. I haven't done calculus in awhile so I'm probably just overlooking something simple.
Thanks!
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