Chapter 2: Problem 83
In Exercises \(81-83 \text { , each function has a graph with an endpoint (a translation of the point }(0,0) .)\) Enter each into your calculator in an appropriate viewing window, and, using your knowledge of the graph of \(y=\sqrt{x}\), determine the domain and range of the function. (Hint: Locate the endpoint.) $$y=-0.5 \sqrt{x+10}+5$$
Short Answer
Step by step solution
Understanding the Basic Function
Analyzing the Function Transformation
Locating the Endpoint
Determining the Domain
Determining the Range
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Function Transformation
In the context of the given function, several transformations occur:
- The basic square root function is initially centered at the origin, \((0, 0)\).
- When transformed as \(y=-0.5 \sqrt{x+10}+5\), it undergoes a horizontal shift to the left by 10 units. This is evident from the \(x+10\) indicating the x-values are adjusted by -10.
- There’s a vertical shift upward by 5 units, which is signified by the "+5" outside the square root.
- A reflection over the x-axis occurs due to the negative coefficient -0.5, flipping the curve upside down.
- The coefficient also causes a vertical shrink, reducing the steepness of the original graph.
Square Root Function
- The domain of the simple square root function is \[0, \infty)\], as square roots are defined only for non-negative values of \(x\).
- The range is also \[0, \infty)\], since the output value \(y\) cannot be negative.
Graphing Functions
Here's how this function is graphed:
- First, identify the endpoint by solving \(x+10=0\), setting \(x=-10\).
- Next, determine the starting point on the y-axis: \(y=5\). This is derived from approaching the root equation through transformations.
- The function is reflected over the x-axis, implying the graph moves downward as \(x\) increases.
- From the endpoint \((-10, 5)\), plot points to show the curve's nature, ensuring the downward trend due to the reflection is illustrated.