Table of contents

0. Review of College Algebra4h 43m
1. Measuring Angles40m
2. Trigonometric Functions on Right Triangles2h 5m
3. Unit Circle1h 19m
4. Graphing Trigonometric Functions1h 19m
5. Inverse Trigonometric Functions and Basic Trigonometric Equations1h 41m
6. Trigonometric Identities and More Equations2h 34m
7. Non-Right Triangles1h 38m
8. Vectors2h 25m
9. Polar Equations2h 5m
10. Parametric Equations1h 6m
11. Graphing Complex Numbers1h 7m

4. Graphing Trigonometric Functions

Graphs of the Sine and Cosine Functions

Trigonometry

4. Graphing Trigonometric Functions

Graphs of the Sine and Cosine Functions

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2:23 minutes

Problem 73

Textbook Question

Graph each function. See Examples 6–8.ƒ(x) = √x + 2

Verified step by step guidance

Identify the basic function: The function \( f(x) = \sqrt{x} \) is a square root function, which typically has a domain of \( x \geq 0 \) and a range of \( y \geq 0 \).

Determine the transformation: The function \( f(x) = \sqrt{x} + 2 \) is a vertical shift of the basic square root function \( \sqrt{x} \) upwards by 2 units.

Find the domain: Since the square root function is defined for \( x \geq 0 \), the domain of \( f(x) = \sqrt{x} + 2 \) is also \( x \geq 0 \).

Find the range: The range of the basic function \( \sqrt{x} \) is \( y \geq 0 \). After the vertical shift, the range of \( f(x) = \sqrt{x} + 2 \) becomes \( y \geq 2 \).

Sketch the graph: Start by plotting the point (0, 2) since \( f(0) = \sqrt{0} + 2 = 2 \). Then, plot additional points by choosing values of \( x \) (e.g., 1, 4, 9) and calculating \( f(x) \). Connect these points with a smooth curve, keeping in mind the shape of the square root function.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Graphing Functions

Graphing functions involves plotting points on a coordinate plane to visualize the relationship between the input (x) and output (ƒ(x)). Understanding how to identify key features such as intercepts, domain, and range is essential for accurately representing the function. For the function ƒ(x) = √x + 2, recognizing that it is a transformation of the square root function will help in sketching its graph.

Square Root Function

The square root function, denoted as √x, is defined for non-negative values of x and produces non-negative outputs. Its graph starts at the origin (0,0) and increases gradually, forming a curve that approaches infinity as x increases. In the function ƒ(x) = √x + 2, the '+2' indicates a vertical shift of the graph upwards by 2 units, affecting the y-values of all points on the graph.

Transformations of Functions

Transformations of functions involve shifting, stretching, or reflecting the graph of a function. In the case of ƒ(x) = √x + 2, the '+2' represents a vertical shift, which moves the entire graph of the square root function up by 2 units. Understanding these transformations is crucial for accurately graphing functions and predicting how changes in the equation affect the graph's appearance.