- #1
Carl_M
- 13
- 0
Homework Statement
f(x) = x^3 +ax^2 +5x +2 and has two stationary points, one of which is x = 2. a) Find the other stationary point.
b) classify the stationary points using the second derivative test
The Attempt at a Solution
f '(x) = 2ax + 3x^2 +5
f ''(x) = 2a + 6x
0 = (2)^3 + a(2^2) +5(2) +2
0 = 8 + 4a + 10 +2
0 = 20 + 4a
-4a = 20, a = -5
What am I supposed to do to get a stationary point?
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