The Student Room Group
Is that meant to be:

xex(2x)xe^{-x}(2-x)

(I think this is what you meant, so you need to do this...)

Spoiler



Or:

xex(2x)xe^{-x(2-x)}

??
Reply 2
LaTeX tip - to do e^(-x), type e^{-x}.

Now first thing to note is that you can just divide through by e^(-x) since it'll never be 0.

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