tailieunhanh - Calculus: An Integrated Approach to Functions and their Rates of Change, Preliminary Edition Part 16

Calculus: An Integrated Approach to Functions and their Rates of Change, Preliminary Edition Part 16. A major complaint of professors teaching calculus is that students don't have the appropriate background to work through the calculus course successfully. This text is targeted directly at this underprepared audience. This is a single-variable (2-semester) calculus text that incorporates a conceptual re-introduction to key precalculus ideas throughout the exposition as appropriate. This is the ideal resource for those schools dealing with poorly prepared students or for schools introducing a slower paced, integrated precalculus/calculus course | Altered Functions Altered Graphs Stretching Shrinking Shifting and Flipping 131 1 y Figure x Answers to Selected Exercises Answer to Exercise 1 x i 1 for x 0 n x x x x I undefined for x 0 h A 1 ------------------o---------------------- -------------------------------------------- - x Figure Your calculator probably won t indicate the pinhole in the graph. Answer to Exercise i. 3 3 2 3 3 2 6 132 CHAPTER 3 Functions Working Together ii. y -1 f T - . - 2 y - 1 - 2y - 2 y 1 1 y 2y - 2 2y - 3 - 1 y iii. 1 x X - 2 1 x 1 x - 1 1 2 1 x x 1 2 i-x x 1 x 2 1- yx 1 x J x 12 1-----l _ 1 x x If you want to add the fractions get a common denominator. x 2 1 x x - 2 2x 2 x 1 x x x 1 x 1 x x 1 x x iv. x h x h 2x 2h x h 1 x - h ------------ 2 x - h ---------------------------------- x - h 1 x - h 1 x - h 1 x - h - 2x2 - 2xh 2x - 2hx - 2h2 2h x - h 1 2x2 - 4xh x - 2h2 h x - h 1 v. 2h d T - 2 2h h h If i_ 4h _ 2h 1 - 4h h 2h 4h 2h 1 _ 2h 1 - 2h 1 h 2h 8h2 4h 2 1 h Altered Functions Altered Graphs Stretching Shrinking Shifting and Flipping 133 8h2 - 2h 1 2h - 1 h 8h - 2 h 1 2h - 1 h 8h - 2 2 4h - 1 -----or----------- 2h 1 2h 1 Solution to Exercise All but the last two pairs of functions give a decomposition. PROBLEMS FOR SECTION 1. The zeros of the function x are at x -4 -1 2 and 8. What are the zeros of a x 5 x b g x x 2 c A x 2x d y x x - 1 Verify your answers analytically. 2. The zeros of the function x are at x -5 -2 0 and 5. Find the zeros of the following functions. If there is not enough information to determine this say so. a g x 3 x b A x w x where w x -2x2 c p x 3 x 1 d x 4 x 1 e x 4 -x f x - x 3. The graph of y x is symmetric about the y-axis. Which of the following functions is equal to x a g x - x b A x -x c j x - -x 4. Using what you know about shifting flipping and stretching match the graphs on page 135 with the equations. a y V b y x-3 c y y p - 1 d y 2 xk 1 e y y-2- -

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