Math Problem Statement
Question 1 (10 points) Consider a function f(x) with the following properties • • • • • f(x) is defined and continu- ous everywhere EXCEPT at x = −3. f has a vertical asymptote at x = −3. lim f(x)=2 x→−∞ limf(x)=−4 x→∞ f(x) is continuous but NOT differentiable at x = 5. • f′(x) > 0 on the interval (1, 5). • f′(x) < 0 on the inter- vals (−∞,−3), (−3,1) and (5, ∞). • f′′(x) > 0 on the intervals (−3, 5) and (5, ∞). • f′′(x) < 0 on the interval (−∞, −3). a) (2 point) At what values of x does f have a local maximum (if any)? local minimum (if any)? b) (2 point) What are the x-coordinates of the inflection points of f (if any)? c) (6 points) Draw, on your own axes, a possible graph of a curve y = f(x).
Solution
Let's break down each part of this problem:
Given information about :
- is continuous everywhere except at , where it has a vertical asymptote.
- End behavior:
- Continuity and differentiability:
- is continuous but not differentiable at .
- First derivative information ():
- on , meaning is increasing on this interval.
- on , , and , meaning is decreasing on these intervals.
- Second derivative information ():
- on and , indicating concave up on these intervals.
- on , indicating concave down on this interval.
Part (a): Local Maximum and Minimum
To identify local maxima and minima, let's use the first derivative information, :
- Decreasing on , increasing on , and decreasing again on , with increasing on .
- Local Maximum: From the given intervals of increase and decrease:
- The function changes from increasing to decreasing at , so has a local maximum at .
2
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Math Problem Analysis
Mathematical Concepts
Calculus
Limits
Continuity
Differentiability
First Derivative Test
Second Derivative Test
Formulas
lim x → -∞ f(x)
lim x → ∞ f(x)
First Derivative Test: Change of sign in f'(x)
Second Derivative Test: Change of concavity based on f''(x)
Theorems
First Derivative Test for local extrema
Second Derivative Test for concavity and inflection points
Suitable Grade Level
Undergraduate Calculus
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