Chapter 14: Problem 19
Draw the \(x y\) region \(R\) that corresponds to the \(u v\) square \(S\) with corners (0,0),(1,0),(0,1),(1,1) . Locate the corners of \(R\) and then its sides (bike a jigsaw puzzle). $$ x=e^{2 u+v}, y=e^{u+2 v} $$
Short Answer
Expert verified
The region \( R \) is defined by the corners: \((1,1), (e^2,e), (e,e^2), (e^3,e^3)\).
Step by step solution
01
Determine the Expression for Corner Points
First, we'll evaluate the given expressions for \( x \) and \( y \) at each corner of the \( uv \) square \( S \). The corners of \( S \) are given as \((0,0), (1,0), (0,1), (1,1)\). Let's substitute each corner into the equations \( x = e^{2u+v} \) and \( y = e^{u+2v} \).
02
Calculate Coordinates for Corner (0,0)
For the corner \((0,0)\), substitute \( u = 0 \) and \( v = 0 \) into the equations:\[ x = e^{2(0) + 0} = e^0 = 1 \]\[ y = e^{0 + 2(0)} = e^0 = 1 \]Thus, the \( xy \) coordinates for the corner \((0,0)\) are \((1,1)\).
03
Calculate Coordinates for Corner (1,0)
For the corner \((1,0)\), substitute \( u = 1 \) and \( v = 0 \) into the equations:\[ x = e^{2(1) + 0} = e^2 \]\[ y = e^{1 + 2(0)} = e \]Thus, the \( xy \) coordinates for the corner \((1,0)\) are \((e^2, e)\).
04
Calculate Coordinates for Corner (0,1)
For the corner \((0,1)\), substitute \( u = 0 \) and \( v = 1 \) into the equations:\[ x = e^{2(0) + 1} = e \]\[ y = e^{0 + 2(1)} = e^2 \]Thus, the \( xy \) coordinates for the corner \((0,1)\) are \((e, e^2)\).
05
Calculate Coordinates for Corner (1,1)
For the corner \((1,1)\), substitute \( u = 1 \) and \( v = 1 \) into the equations:\[ x = e^{2(1) + 1} = e^3 \]\[ y = e^{1 + 2(1)} = e^3 \]Thus, the \( xy \) coordinates for the corner \((1,1)\) are \((e^3, e^3)\).
06
Summary of Transformed Corners
Now we have calculated all transformed \( xy \) corners from the \( uv \) square:- \((0,0)\) becomes \((1,1)\)- \((1,0)\) becomes \((e^2,e)\)- \((0,1)\) becomes \((e,e^2)\)- \((1,1)\) becomes \((e^3,e^3)\)These are the vertices of the region \( R \).
07
Draw the Region \( R \)
Using the transformed vertices, plot the points \((1,1), (e^2,e), (e,e^2), (e^3,e^3)\). Connect these points like a jigsaw to form a region. The outcome is a contrast to the original square shape, but these points represent the boundary of region \( R \) in the \( xy \) plane.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Coordinate Transformation
In multivariable calculus, coordinate transformation is a process where we switch from one coordinate system to another. This transition simplifies complex equations or helps in visualizing problems in a new light. In the given exercise, we transformed a square in the \(uv\) plane into a region in the \(xy\) plane.
- The original \(uv\) square had corners at \((0,0), (1,0), (0,1), (1,1)\).
- We used the transformations \(x = e^{2u + v}\) and \(y = e^{u + 2v}\) to find the new points in the \(xy\) plane.
- This transformation maps each \((u, v)\) point to a new \((x, y)\) coordinate.
Exponential Functions
Exponential functions are mathematical functions of the form \(e^x\), where \(e\) is Euler's number, approximately equal to 2.718. They play a critical role in various scientific domains due to their unique growth properties.
- These functions grow rapidly and are used to model phenomena such as population growth, radioactive decay, and even financial calculations.
- In our exercise, the equations \(x = e^{2u + v}\) and \(y = e^{u + 2v}\) involve exponential functions with variables \(u\) and \(v\).
- Here, the exponential terms transform each \(uv\) coordinate pair into an \(xy\) coordinate pair, stretching or compressing based on the exponents.
XY Plane
The \(xy\) plane is a two-dimensional coordinate system crucial in graphing relationships and transformations between different mathematical entities. It consists of two axes:
- The \(x\)-axis, which runs horizontally.
- The \(y\)-axis, which runs vertically.
- Points in this plane are defined by pairs \((x,y)\).