tailieunhanh - Calculus: An Integrated Approach to Functions and their Rates of Change, Preliminary Edition Part 15

Calculus: An Integrated Approach to Functions and their Rates of Change, Preliminary Edition Part 15. 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 | Decomposition of Functions 121 equation -2 - 5- 4 0 for -. Once we have found - we can solve7 for x easily because we know - x2. Breaking the original hard problem into two easier subproblems makes solving the original problem possible. -2 5- 4 0 - 4 - 1 0 - 4 or - 1 But - 2. x2 4 or x2 1 x 2 or x 1. The solutions to x4 - 5x2 4 0 are x -2 -1 1 2. Calculus involves the study of rates of change of functions. Later in this text when we are looking for the rate of change of a composite function we will use the same approach of decomposition to decompose the function and flnd its rate of change from our knowledge of the rates of change of these simpler PROBLEMS FOR SECTION 1. Let h x g x and suppose that h x --Write possible formulas for x Vx2 6 and g x . 2. For each of the functions given below give possible formulas for x and g x such that h x g x . Do not let g x x do not let x x. a h x Vx2 3 b h x Vx Vx c h x . . . d h x 5 x2 3x3 3 3. Let j x . 2 . Suppose that j x h g x . Write possible formulas for 3 5 4x2 3 x g x and h x . None of g and h should be the identity function. 4. Let j x 10 x 2 2x2 3. Give two possible decompositions of j x such that j x g h x . None of the functions g and h should be the identity function. 5. Let h x g x where x x2. If h t 2 1 what is g x 7 For more on solving quadratics see Appendix A Algebra. 8 The method of constructing the rate of change function of a composite function is called the Chain Rule. 122 CHAPTER 3 Functions Working Together Decompose the functions in Problems 6 through 9 by finding functions f x and g x fix x and g x x such that h x f g x . 6. h x x2 7x 1 3 7. h x 2 4 8. h x fi x - 1 9. h x fix 2 fix 3 In Problems 10 through 17 findfunctions f and g such that h x f g x and neither f nor g is the identity function . f x x and g x x. Answers to these problems are not unique. 10- h x 5 11. h x 3x4 2x2 3 12. h x 5 x 2 4 x 7 13. h x 2 3x 4 14. h x x 2 15. h x fi5x2 3 16. h x 32x 3x 1 17. h x 4n2x 3nx

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