TAILIEUCHUNG - Calculus: An Integrated Approach to Functions and their Rates of Change, Preliminary Edition Part 46

Calculus: An Integrated Approach to Functions and their Rates of Change, Preliminary Edition Part 46. 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 | Finding the Inverse of a Function 431 This makes sense The function f cubes its input multiplies the result by 4 and then adds 2. To undo this we must subtract 2 divide the result by 4 and then take the cube root. See the diagram below for clarification. EXAMPLE Let g x g-1 x if g is invertible. At first glance it may seem that if g is the squaring function its inverse must be the square root function. But we must be careful. g is not invertible because it is not 1-to-1. The problem is that given any positive output say 4 it is impossible to determine uniquely the corresponding input. The input corresponding to 4 could be 2 or -2. 432 CHAPTER 12 Inverse Functions Can What Is Done Be Undone Figure Had we not noticed this and proceeded to look for the inverse analytically we would soon realize that there was a problem. Set y x2 and then interchange the roles of x and y to obtain an inverse relationship. x y2 Solve for y. y x y is not a function of x. What we can do is restrict the domain of g to make g 1-to-1. If we restrict the domain to 0 rc then g-1 x x. If we restrict the domain to -rc 0 then g-1 x x. i g x on 0 g-1 x 4x ii g x on - 0 g-1 x - 4x Figure Observation If a function is not 1-to-1 on its natural domain it is possible to restrict the domain in order to make the function invertible. Note that the domain of f is the range of f 1 and the range of f is the domain of f 1. PROBLEMS FOR SECTION 1. For each of the functions f g and h below do the following. a Sketch the function and determine whether it is invertible. b If the function is invertible sketch the inverse function on the same set of axes as the function and flnd a formula for the inverse function. Finding the Inverse of a Function 433 c Identify the domain and range of the function and its inverse. i. x x 1 ii. 4 Cx 1 iii. A x y 1 2. For each of the functions below flnd 1 x . a x 2 - X 1 b x 10 7 3. Suppose is an invertible function. a If is increasing is -1 .

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