Posted by elis on Tuesday, July 19, 2011 at 11:29pm.
Use the product rule.
d/dx (u*v) = u(dv/dx) + v(du/dx)
u = x^(1/2)
du/dx = (1/2)*x(-1/2)
v = e^-x
dv/dx = -e^-x
You do the rest
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