Katie M.
asked 04/09/19
The function f(x)=(3x+9)e−3x has one critical number. Find it.
Mark M.
answered 04/10/19
Mathematics Teacher - NCLB Highly Qualified
The one critical point is the zero of the function.
0 = (3x + 9)e - 3x
0 = 3ex + 9e - 3x
0 = ex + 3e - x
0 = ex - x + 3e
-3e = x(e - 1)
-3e / (e - 1) = x
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