Determine whether each relation defines y as a function of x. Give the domain and range. See Example 5. y=√(7-2x)
Table of contents
- 0. Review of Algebra4h 18m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations1h 43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 5m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 22m
- 10. Combinatorics & Probability1h 45m
3. Functions
Intro to Functions & Their Graphs
Problem 97
Textbook Question
For each function graphed, give the minimum and maximum values of ƒ(x) and the x-values at which they occur.

Verified step by step guidance1
Step 1: Identify the maximum value of the function by locating the highest point on the graph. Observe the y-coordinate of this point and note the corresponding x-value.
Step 2: Identify the minimum value of the function by locating the lowest point on the graph. Observe the y-coordinate of this point and note the corresponding x-value.
Step 3: Write down the maximum value as ƒ(x) = (maximum y-value) and the x-value where it occurs as x = (corresponding x-value).
Step 4: Write down the minimum value as ƒ(x) = (minimum y-value) and the x-value where it occurs as x = (corresponding x-value).
Step 5: Verify that these points are indeed local extrema by checking the behavior of the graph around these points (the graph should change direction at these points).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Local Maximum and Minimum
Local maximum and minimum values of a function are points where the function reaches a highest or lowest value in a small neighborhood. These points are important for understanding the behavior of the function and are often found where the slope changes direction.
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Maximum Turning Points of a Polynomial Function
Reading Graphs to Identify Extrema
To find minimum and maximum values from a graph, observe the highest and lowest points on the curve within the domain. The x-values at these points correspond to where the function attains these extrema, and the y-values give the minimum or maximum function values.
Recommended video:
Identifying Intervals of Unknown Behavior
Function Notation and Interpretation
ƒ(x) represents the output value of the function at input x. Understanding this notation helps in interpreting the graph, where the y-axis shows ƒ(x) values and the x-axis shows input values, allowing identification of points where ƒ(x) is minimized or maximized.
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Interval Notation
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