Concept explainers
For Exercises 49–52, evaluate the function for the given values of x.(See Example 5)
a. g(–3)
b. g(3)
c. g(–2)
d. g(0)
e. g(4)
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College Algebra Essentials
- Suppose f and g are the piecewise-defined functions defined here. For each combination of functions in Exercises 51–56, (a) find its values at x = -1, x = 0, x = 1, x = 2, and x = 3, (b) sketch its graph, and (c) write the combination as a piecewise-defined function. f(x) = { (2x + 1, ifx 0 g(x) = { -x, if x 2 8(4): 51. (f+g)(x) 52. 3f(x) 53. (gof)(x) 56. g(3x) 54. f(x) – 1 55. f(x – 1)arrow_forwardIn Exercises 27–28, let f and g be defined by the following table: f(x) g(x) -2 -1 3 4 -1 1 1 -4 -3 -6 27. Find Vf(-1) – f(0) – [g(2)]² + f(-2) ÷ g(2) ·g(-1). 28. Find |f(1) – f0)| – [g(1)] + g(1) ÷ f(-1)· g(2).arrow_forwardIn Exercises15–36, find the points of inflection and discuss theconcavity of the graph of the function. f(x)=\frac{6-x}{\sqrt{x}}arrow_forward
- In Exercises 83–85, you will use a CAS to help find the absolute extrema of the given function over the specified closed interval. Per-form the following steps. a. Plot the function over the interval to see its general behavior there. b. Find the interior points where ƒ′ = 0. (In some exercises, you may have to use the numerical equation solver to ap-proximate a solution.) You may want to plot ƒ′ as well. c. Find the interior points where ƒ′ does not exist. d. Evaluate the function at all points found in parts (b) and (c) and at the endpoints of the interval. e. Find the function’s absolute extreme values on the interval and identify where they occur. 83. ƒ(x) = x4 - 8x2 + 4x + 2, [-20/25, 64/25] 84. ƒ(x) = -x4 + 4x3 - 4x + 1, [-3/4, 3] 85. ƒ(x) = x^(2/3)(3 - x), [-2, 2]arrow_forwardThe function f(x) = 0.4x2 – 36x + 1000 models the number of accidents, f(x), per 50 million miles driven as a function of a driver's age, x, in years, for drivers from ages 16 through 74, inclusive. The graph of f is shown. Use the equation for f to solve Exercises 45–48. 1000 flx) = 0.4x2 – 36x + 1000 16 45 74 Age of Driver 45. Find and interpret f(20). Identify this information as a point on the graph of f. 46. Find and interpret f(50). Identify this information as a point on the graph of f. 47. For what value of x does the graph reach its lowest point? Use the equation for f to find the minimum value of y. Describe the practical significance of this minimum value. 48. Use the graph to identify two different ages for which drivers have the same number of accidents. Use the equation for f to find the number of accidents for drivers at each of these ages. Number of Accidents (per 50 million miles)arrow_forwardIn Exercises 83–86, determine whether thestatement is true or false. If it is false, explain why or give anexample that shows it is false. If the graph of a function has three x-intercepts, then it musthave at least two points at which its tangent line is horizontalarrow_forward
- In Exercises 181–184, determine whetherthe statement is true or false. If it is false, explain why or givean example that shows it is false. The slope of the function f (x) = cos bx at the origin is −b.arrow_forwardIn Exercises 37–40, graph the function to see whether it appears to have a continuous extension to the given point a. If it does, use Trace and Zoom to find a good candidate for the extended function’s value at a. If the function does not appear to have a continuous extension, can it be extended to be continuous from the right or left? If so, what do you think the extended function’s value should be?arrow_forwardIn Exercises 51–54, graph the function ƒ to see whether it appears to have a continuous extension to the origin. If it does, use Trace and Zoom to find a good candidate for the extended function’s value at x = 0. If the function does not appear to have a continuous extension, can it be extended to be continuous at the origin from the right or from the left? If so, what do you think the extended function’s value(s) should be?arrow_forward
- For Problems 4 – 8, let S be an uncountable set. Label each of the following statements as true or false, and justify your answer. There exists a bijective function f : J → S.arrow_forwardFor Exercises 93–102, write the domain of the function in interval notation. VI - P 93. f(x) = V9 - ? 95. h(a) = Va² – 5 94. g(t) = 96. f(u) = Vu? – 7 97. p(x) = V2x? + 9x – 18 98. q(x) = V4x² + 7x – 2 - 1 1 99. r(x) 100. s(x) V2r + 9x – 18 V4x + 7x – 2 - 3x 2x 101. h(x) = 102. k(x) = Vx + 2 Vx + 1arrow_forwardIn Exercises 17–20, the linear function. use the limit definition to calculate the derivative ofarrow_forward
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