Textbook Question
Use the vertical line test to identify graphs in which y is a function of x.
Ch. 2 - Functions and Graphs
Blitzer8th EditionCollege AlgebraISBN: 9780136970514
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Table of contents
- Ch. P - Fundamental Concepts of Algebra311
- Ch. 1 - Equations and Inequalities398
- Ch. 2 - Functions and Graphs407
- Ch. 3 - Polynomial and Rational Functions306
- Ch. 4 - Exponential and Logarithmic Functions247
- Ch. 5 - Systems of Equations and Inequalities173
- Ch. 6 - Matrices and Determinants143
- Ch. 7 - Conic Sections124
- Ch. 8 - Sequences, Induction, and Probability251
Chapter 3, Problem 15
Find the average rate of change of the function from x1 to x2. f(x) = x² + 2x from x1 = 3 to x2 = 5
Verified step by step guidance1
Identify the function given: \(f(x) = x^{2} + 2x\).
Note the interval over which to find the average rate of change: from \(x_1 = 3\) to \(x_2 = 5\).
Calculate the function values at the endpoints: find \(f(3)\) and \(f(5)\) by substituting \(x = 3\) and \(x = 5\) into the function.
Use the formula for average rate of change: \(\frac{f(x_2) - f(x_1)}{x_2 - x_1}\).
Substitute the values of \(f(5)\), \(f(3)\), \(x_2\), and \(x_1\) into the formula and simplify the expression to find the average rate of change.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Average Rate of Change
The average rate of change of a function over an interval measures how much the function's output changes per unit change in input. It is calculated as the difference in function values divided by the difference in input values, similar to the slope of a secant line between two points on the graph.
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Change of Base Property
Function Evaluation
Function evaluation involves substituting specific input values into the function to find corresponding output values. For example, to find f(3) and f(5) for f(x) = x² + 2x, substitute 3 and 5 into the expression and simplify to get the function values needed for the average rate of change.
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Quadratic Functions
A quadratic function is a polynomial of degree two, typically in the form f(x) = ax² + bx + c. Its graph is a parabola, and understanding its shape helps interpret changes in function values. Here, f(x) = x² + 2x is quadratic, so its rate of change varies across intervals.
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Related Practice
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