Sketch the graph of a function that satisfies all of the given conditions.vertical asymptote x = 0,f ′(x) > 0 if x < −3,f ′(x) < 0 if x > −3 (x ≠ 0),f ″(x) < 0 if x < 0,f ″(x) > 0 if x > 0
Question
Sketch the graph of a function that satisfies all of the given conditions.vertical asymptote x = 0,f ′(x) > 0 if x < −3,f ′(x) < 0 if x > −3 (x ≠ 0),f ″(x) < 0 if x < 0,f ″(x) > 0 if x > 0
Solution
To sketch the graph of a function that satisfies all of the given conditions, follow these steps:
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Draw a vertical line at x = 0. This represents the vertical asymptote.
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The condition f′(x) > 0 if x < -3 means that the function is increasing for x < -3. Sketch a portion of the graph to the left of x = -3 that is rising as you move from left to right.
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The condition f′(x) < 0 if x > -3 (x ≠ 0) means that the function is decreasing for x > -3. Sketch a portion of the graph to the right of x = -3 that is falling as you move from left to right. Remember to leave a gap at x = 0 because of the vertical asymptote.
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The condition f″(x) < 0 if x < 0 means that the function is concave down for x < 0. Make sure the portion of the graph to the left of x = 0 is shaped like an upside-down cup (i.e., ).
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The condition f″(x) > 0 if x > 0 means that the function is concave up for x > 0. Make sure the portion of the graph to the right of x = 0 is shaped like a right-side-up cup (i.e., /).
Remember, this is a sketch, so it doesn't have to be perfect. The important thing is that it shows the correct behavior in each region divided by the vertical asymptote and the point x = -3.
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