Presentation on theme: "Here’s the Graph of the Derivative …. Tell me About the Function"— Presentation transcript:
1Here’s the Graph of the Derivative …. Tell me About the Function Lin McMullinCalculus for AP* by Rogawski and CannonWebinar February 15, 2012
2AP Calculus Free-response Questions StandardSynthesisArea – VolumeDifferential EquationFunctionsPower Series (BC)Polar, Parametric & Vector (BC)Rate / AccumulationParticle MotionTable StemGraph StemsFamily/Generic FunctionsComprehensive are not so much in the textbooks etc.
4AP Calculus Graph-stem Questions 2011 AB 4 / BC 4 The graph of the derivative Stem: Graph(a) f defined by integral-5.4FTC5.34.4Evaluate from graph g, g' (and g'')(b) max/min4.3, 4.7(3.6)4.3Justify(c) POI3.4Give reason(d) Average ROC2.1(P1)2.4MVT3.24.2
5AP Calculus Graph-stem Questions 1996 AB 1They asked fora. Relative maximum, why?b. Relative minimum, why?c. Concave up – interval Justifyd. Sketch the graph such that f(0) = 1 on [0,2]
6AP Calculus Graph-stem Questions 1996 AB 1IncreasingDecreasingAbsolute MinimumAbsolute MaximumLocal MinLocal MaxUpDownPOIThey asked fora. Relative maximum, why?b. Relative minimum, why?c. Concave up – interval Justifyd. Sketch the graph such that f(0) = 1 on [0,2]
7AP Calculus Graph-stem Questions Year & NumberMean% 9% Zero2003 AB 42.68n/a20.42004 AB 52.631.028.02006 AB 33.244.022.02008 AB 42.602.329.72009 AB 14.674.99.62009 AB 62.070.223.82010 AB 51.750.338.92011 AB 52.440.429.5Why?Not in textbooksParts from different parts of the textbook“below expectations” 2011Performed “very poorly” 2010“performed well”performance was “generally poor”2008 performance “varied widely”2004 “relatively poorly”2003 a “disappointment”Problems: arithmetic/algebra, communications skills – integrals and justifications“weakness in verbal communication”2006 “Students need to improve their ability to interpret graphical data”
9AP Calculus Graph-stem Questions Method 1 Think Tangent LineThe derivative is the slope of the tangent line and we see the graph mimics the tangent line, so we turn that around and use these ideas ….Rogawski §4.4 First AppletWinplot Demo
10AP Calculus Graph-stem Questions FeatureConclusiony' > 0y is increasingy' < 0y is decreasingy' changes - to +y has a local minimumy' changes + to -y has a local maximumy' increasingy is concave upy' decreasingy is concave downy' extreme valuesy has points of inflectionFirst Derivative TestNote the concern with sign change, not y’ = 0Discuss x = 1 on 1996 AB 1: decreasing – horizontal tangent – decreasing.
11AP Calculus Justifications ConclusionJustificationy is increasingy' > 0y is decreasingy' < 0y has a local minimumy' changes - to +y has a local maximumy' changes + to -y is concave upy' increasingy is concave downy' decreasingy has points of inflectiony' extreme valuesFirst Derivative TestNote the concern with sign change, not y’ = 0Discuss x = 1 on 1996 AB 1: decreasing – horizontal tangent – decreasing.
12AP Calculus Graph-stem Questions 2009 AB 1Note: A motion problemvocabularyAcceleration = second derivative = slopeMeaning of integral and find valueShe turns around at a local extreme value = graph crosses + to –Find distance from integral = more usual question(d) Karen 1.4 miles
13AP Calculus Graph-stem Questions 2006 AB 3FTC function defined by an integralg’’ = slope of g’ = slope of fMax/min and justifyPeriodic function: write tangent line = point (108, 44) and f(108) = 2What else could you ask?What could you ask in earlier grades?
14AP Calculus Graph-stem Questions Method 2 AccumulationThe given might include the graph of and ask aboutHere we use the Fundamental Theorem of Calculus to see that with the initial conditionC may or may not be an endpoint
15Graphing without Derivatives (The graph of f consists of a semicircle and two line segments)C may or may be an endpointTell me all the usual stuff about the graph of and explain your reasoning without mentioning the derivative or any concepts related to the derivative.
17Graphing without Derivatives C may or may be an endpoint
18Graphing without Derivatives C may or may be an endpoint
19Graphing without Derivatives xg(x)-6?-4? + p-2? + 2p? + 2p –1 = 7? = 8 – 2p234C may or may be an endpointDiscuss Riemann sum terms with negative function valuesArea “below the graph”
20Graphing without Derivatives xg(x)-68 – 2p-48 – p-28727 – 3 = 434 – 1 = 343 + 1 = 4C may or may be an endpoint
21Graphing without Derivatives xg(x)– 68 – 2p– 48 – p– 287243LocationFeatureConcavity(-6, 8 – 2p)Absolute minimum– 6 ≤ x ≤ – 2Increasing(– 2, 8)Absolute Maximum– 2 ≤ x ≤ 3Decreasing(3,3)Local Minimum3 ≤ x ≤ 4(4, 4)Endpoint MaximumC may or may be an endpoint
22Graphing without Derivatives LocationFeatureConcavity(– 6, 8 – 2p)Absolute minimum–– 6 ≤ x ≤ – 4IncreasingUp(– 4, 8 – p)Point of Inflection– 4 ≤ x ≤ – 2Down(– 2, 8)Absolute Maximum– 2 ≤ x ≤ 0Decreasing0 ≤ x ≤ 2(2, 4)2 ≤ x ≤ 3(3,3)Local Minimum3 ≤ x ≤ 4(4, 4)Endpoint MaximumC may or may be an endpoint
23Graphing without Derivatives Winplot Concavity Demo 2Demo 3 any functionDemo 4 linked windows’Demo 5 Is the examples used in the slides above.
24AP Calculus Graph-stem Questions 2010 Above2011 AB 42010 AB 3 Amusement Park
26SuggestionsFind and assign all you can of questions with a graph from you text, from past exams ….Use released AP questionsCumulative tests and assignmentsGo further with each questions; find other features that can be determined from the graphs you havePractice justifications; have students explain why the graphs have these featuresUse at the end of the year to draw together disparate topicsBe aware that your textbook does not group these ides and others in one section. They are spread thru your book therefore [bullet 1]Better yet [bullet 2]Extend and adapt the questions [bullet 3]Stress writing from day 1, algebra 1 [bullet 4]Use these to pull the disparate ideas together [bullet 5]
27Information E-mail: firstname.lastname@example.org The PowerPoint slides, the Winplot files, a detailed handout including a brief list of questions on this topic from Calculus by Rogawski and Cannon are here:Click on AP CalculusFor more information on the textbook:
28Here’s the Graph of the Derivative …. Tell me About the Function Lin McMullinCalculus by Rogawski and CannonWebinar February 15, 2012