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Section 4.3 : Minimum and Maximum Values

  1. Below is the graph of some function, \(f\left( x \right)\). Identify all of the relative extrema and absolute extrema of the function.
    The graph of \(f\left( x \right)\) on \( - 4 \le x \le 5\).  Starting at approximately \(\left( { - 4, - 1} \right)\) the graph decreases to a valley at approximately \(\left( { - 3, - 1.5} \right)\), then increases to a peak at \(\left( { - 1,2} \right)\), then falls steadily to a sharp valley at \(\left( {2, - 6} \right)\), then rises steeply to a peak at \(\left( {4,5} \right)\) and finally decreases a little to approximately \(\left( {5,2} \right)\) at the right end.
    Solution
  2. Below is the graph of some function, \(f\left( x \right)\). Identify all of the relative extrema and absolute extrema of the function.
    The graph of \(f\left( x \right)\) on \( - 5 \le x \le 9\).  Starting at approximately \(\left( { - 5,6} \right)\) the graph decreases to a valley at approximately \(\left( { - 3, - 1} \right)\), rises very slightly to a small peak at approximately \(\left( { - 2, - 0.5} \right)\), then drops to another valley at approximately \(\left( { - 1, - 1} \right)\).  It then rises steeply to a peak at approximately \(\left( {1,3} \right)\), drops sharply to a valley at \(\left( {2, - 4} \right)\), rises again to a peak at approximately \(\left( {6,8} \right)\) and then falls steeply, crossing the x-axis near \(x = 8\) and continuing down to approximately \(\left( {9, - 6} \right)\).
    Solution
  3. Sketch the graph of \(g\left( x \right) = {x^2} - 4x\) and identify all the relative extrema and absolute extrema of the function on each of the following intervals.
    1. \(\left( { - \infty ,\infty } \right)\)
    2. \(\left[ { - 1,4} \right]\)
    3. \(\left[ {1,3} \right]\)
    4. \(\left[ {3,5} \right]\)
    5. \(\left( { - 1,5} \right]\)
    Solution
  4. Sketch the graph of \(h\left( x \right) = - {\left( {x + 4} \right)^3}\)and identify all the relative extrema and absolute extrema of the function on each of the following intervals.
    1. \(\left( { - \infty ,\infty } \right)\)
    2. \(\left[ { - 5.5, - 2} \right]\)
    3. \(\left[ { - 4, - 3} \right)\)
    4. \(\left[ { - 4, - 3} \right]\)
    Solution
  5. Sketch the graph of some function on the interval \(\left[ {1,6} \right]\) that has an absolute maximum at \(x = 6\) and an absolute minimum at \(x = 3\). Solution
  6. Sketch the graph of some function on the interval \(\left[ { - 4,3} \right]\) that has an absolute maximum at \(x = - 3\) and an absolute minimum at \(x = 2\). Solution
  7. Sketch the graph of some function that meets the following conditions :
    1. The function is continuous.
    2. Has two relative minimums.
    3. One of relative minimums is also an absolute minimum and the other relative minimum is not an absolute minimum.
    4. Has one relative maximum.
    5. Has no absolute maximum.
    Solution