KEY Calculus AB Chapter 4a5Review Chapter Part 1 Test Review (Attn: This review DOES NOT include Section 5.6) 1. When looking for absolute extrema, where do the possible extrema exist, and how do you find them? at endpoints and critical points find first derivative f to c and see absmax ano min values set f o solve for values plug in all candidates 2. How do you justify relative extrema? 1stderivative test lookatvalues were fi changessign f goesfrom f goesfrom ire max 2ndderivative test findwure t is o orone andfindsign off criticalvalues 3. How do you justify that a function is increasing or decreasing? fix when increases re min f c o rel max f o rel min fi so when f a o far decreases fix is concave up wun f 4. How do you justify that a function is concave up or concave down? o fix is concave down wun f Lo 5. How do you justify that a function has a point of inflection? f has a point of inflection when f o ou DNE AND has a signchange at that value of 6. Using the graph of g (x) below, determine the signs of g ' x and g '' x at each point. Explain your reasoning. At x = a …gca At x = b … gas At x = c … gus At x = d … ca g decreasing concave horizontal tangent concaveup so glass horizontal tangent g (x) up so gca co and Casso g o andg so gco o andgice co concavedown so decreasing concavedown sogcascoandgcasco 7. Given the graph of f ' below answer each of the following questions, and justify your response with a statement that contains the phrase “since f ' ____________________ …” a) When is f increasing? since f c is b) When is f decreasing? since f co on Cbd o on cab V d e increasing on those interval intervals c) When is f concave up? d) When is f concave down? since fi is increasing on ce f is concave up on that interval since f is decreasing on Lac o o x b and f is concavedown on that interval e) When does f have a relative maximum? since f f is decreasing on that f f) When does f have a relative minimum? since f changes t has a rel max from g) When does f have a point of inflection? D from o o d and f changes t has a rel min a 8. Find the value of c guaranteed by the MVT for f X Hb f x 8 f c 8ct5 5 f.cc fu b 4 x2 x 5 x on the interval [–2, 1]. sects i i z sets 3 3 sects so 4 a 442 sci 4 5 9 4C25 so23 1610 6 fc 9. [Calculator Allowed] Find the value of c guaranteed by the MVT for X [ f x sin x on the interval [4, 5]. : For those of you doing this problem algebraically, the answer is NOT c 1.774 …Why?] fuss fed f x cost c cosCo 2oz f.cc b a cosc zit 1.774 f c cosc 10. Suppose y x 3 c 1.774 sins since s 4 cosc f 4S_sinus fess sines c 4.509 butnot on interval 4,53 o2oz 3 x . [No Calculator] a) Find the zeros of the function. x 1 2 37 0 o y B x B b) Determine where y is increasing or decreasing and justify your response. 2 a i y is increasing on C is Duct s y 3 3 0 s s i i b c y o on use intervals 3h2 D 0 g't He y't ex Dcx D o on C i D b c x y x i I c) Determine all local extrema and justify your response. rel max y i rel min as x i L13 3CD yl is xD 13 2 i s z is decreasing y LO on this interval rei.max z ci.z zoa rel min 2 d) Determine the points where y is concave up or concave down, and find any points of inflection. Justify your responses. 6x y 0 o o x o t.us y is concave down on y on bk a co ofnc.is is concave up bc y o e) Use all your information to sketch a graph of this function. incr i i v challenges 12. If f ' x flx x 2 9x I i r X I 1 , what does f (x) equal? 9 t x t C i p.o.i.ax co 3 dear dear down up down o Co.o inc up o fiasco fiasco f m of c co o 13. Suppose d2y dx 2 x3 4 x 2 . Justify each response below. a) Where is y concave up? x3 4 2 0 x o x 43 0 b) Where is y concave down? Co o v x 4 s 0 o 0 4 is fus acid fun 4 0,4 c) Are there any inflection points on y? If so, where? d pro i x f has 4 a signchange 14. [Calculator Allowed] The derivative of h x is given by h ' x Zoos x Justify EVERY response. age coscx a) Where is h (x) increasing? 5 Iu 2b 73,25 b) Where is h (x) concave down? C5.760 2.618 V xE o ta x E x at x mo t x at 0 IT x 0.524 3.665 4 az rel max 5.760 0.524 2.6183.665 bc f . has changefrom 0 a child changefrom 3.665,2618 d) Does h (x) have a point(s) of inflection? If so, where? changes sign 15. A rectangle is inscribed between the parabolas y 4 x and y 30 x as shown in the picture. Hs What is the maximum area of such a rectangle? Justify your response using CALCULUS. 2 Chap 5 part aromas 2 2 ,2 . x c) Find the x-coordinates of all extrema of h (x) on the interval 2 , 2 when h x O andendpoints zit isat rel mina x 1 on the interval 6 o Eatzit coshes o when u 2 cos x 2 0 0 0 at 16. USE CALCULUS: Find the maximum area of a rectangle inscribed under the curve f x Chap 5 part aged 16 x2 . 2 17. [Calculator Allowed] USE CALCULUS: A rectangle is inscribed under one arch of y 8 cos 0.3 x with its base on cat the x-axis and its upper two vertices on the curve symmetric about the y-axis. What is the largest area the rectangle can have? arms Chap 5 part 2 18. The function f is continuous on [0, 3] and satisfies the following: x f f' f '' 0 0 –3 0 0<x<1 Neg Neg Pos 1 –2 0 1 1<x<2 Neg Pos Pos 2 0 DNE DNE 2<x<3 Pos Pos Pos 3 3 4 0 a) Find the absolute extrema of f and where they occur. fo f l O f 2 2 o f3 3 differentiable abs min z 0 1 2 abs max 3 at 3,3 b) Find any points of inflection. none no change in sign for f c) Sketch a possible graph of f. 3 z i i Go back andzReview the questions from your assignments in this chapter … Understand your notecards!