# Calculus

posted by Jamie

Determine the maximum and minimum value of the function f(x)=-xe^x + 2.

1. Damon

Forget the calculus, sketch a graph.

2. Damon

-10 2.0005
-3 2.14
-2 2.27
-1 2.4 maximum
-0.5 2.3
0 2
1 -.72
2 -12.8
10 -220,263 minimum as x -->oo

derivative
y' = -[ xe^x + e^x]
= -e^x [x+1]
so max or min at x = -1
second derivative
y" = - [e^x(1)+(x+1)e^x]
= -e^x [ x+2 ]
if x = -1
then = -(1/e)(1)
negative so maximum

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