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A critical point (or stationary point) of f(x) is a point (a;f(a)) such that f0(a) = 0. Recall that, geometrically, these are points on the graph of f(x) who have a \ at" tangent line, i.e. a constant tangent line. Critical Points f(x) Example 1: Find all critical points of f(x) = x3 3x2 9x+ 5. We see that the derivative is f0(x) = 3x2 6x 9.
Classify Critical Points 1. Find all critical points of fx( ). 2. Use the 1st derivative test or the 2nd derivative test on each critical point. Mean Value Theorem If fx( )[,](,) a ()-¢=-. ( )+1) ( ) ( ) + =-¢ ¢()
This collection of solved problems covers elementary and intermediate calculus, and much of advanced calculus. We have aimed at presenting the broadest range of problems that you are likely to encounter—the
Find all extreme values. Identify the type and where they occur. For example, an answer could be written as “absolute max of at. .”. 1. 2. 3. Find the critical points.
Problem 11.1: Find all critical points for the following functions. If there are in nitely many, indicate their structure. For f(x) = cos(x) for example, the critical points can be written as ˇ=2 + kˇ, where kis an integer. a) f(x) = x6 3x2. b) f(x) = 4sin(ˇx) + 3 c) f(x) = exp( x2)x2. d) f(x) = sin(cos(ˇx))
To check if a critical point is maximum, a minimum, or a saddle point, using only the first derivative, the best method is to look at a graph to determine the kind of critical point. For some applications we want to categorize the critical points symbolically.
Calculus II Practice Problems 1: Answers 1. Solve for x: a) 6x 362 x Answer. Since 36 62, the equation becomes 6x 62 2 x, so we must have x 2 2 x which has the solution x 4 3. b) ln3 x 5 Answer. If we exponentiate both sides we get x 35 243. c) ln2 x 1 ln2 x 1 ln2 8 Answer. Since the difference of logarithms is the logarithm of the quotient, we ...
