The green dotted line in the graph below represents the function . The blue solid line represents the function , which is the function after it has gone through a shift transformation. Find the equation for .
Table of contents
- 0. Review of College Algebra4h 45m
- 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
0. Review of College Algebra
Transformations
Problem 5
Textbook Question
Fill in the blank(s) to correctly complete each sentence.
The graph of ƒ(x) = -√x is a reflection of the graph of y = √x across the ___-axis.
Verified step by step guidance1
Identify the original function and the transformed function. The original function is \(y = \sqrt{x}\), and the transformed function is \(f(x) = -\sqrt{x}\).
Recognize that the negative sign in front of the square root affects the output values (the \(y\)-values) of the function, changing their sign.
Understand that changing the sign of the \(y\)-values corresponds to reflecting the graph across the \(x\)-axis.
Therefore, the graph of \(f(x) = -\sqrt{x}\) is a reflection of the graph of \(y = \sqrt{x}\) across the \(x\)-axis.
Fill in the blank with '\(x\)' to complete the sentence: 'The graph of \(f(x) = -\sqrt{x}\) is a reflection of the graph of \(y = \sqrt{x}\) across the \(x\)-axis.'
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Square Root Function
The square root function, y = √x, produces the principal (non-negative) root of x and is defined for x ≥ 0. Its graph starts at the origin and increases slowly, forming a curve in the first quadrant. Understanding this base function is essential before analyzing transformations.
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Imaginary Roots with the Square Root Property
Reflection Across an Axis
Reflection across an axis means flipping a graph over that axis, creating a mirror image. Reflecting a function y = f(x) across the x-axis changes it to y = -f(x), inverting all y-values. This concept helps identify how the graph of y = -√x relates to y = √x.
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Reflections of Functions
Function Transformations
Function transformations include shifts, stretches, compressions, and reflections that alter a graph's position or shape. Recognizing how multiplying a function by -1 reflects it across the x-axis is key to completing the sentence about the graph of ƒ(x) = -√x.
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Domain and Range of Function Transformations
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