Chapter 7: Problem 36
In Problems \(21-44,\) find an equation of the hyperbola that satisfies the given conditions. Center \((2,3),\) one focus \((0,3),\) one vertex (3,3)
Short Answer
Expert verified
The hyperbola equation is \( (x-2)^2 - \frac{(y-3)^2}{3} = 1 \).
Step by step solution
01
Identify the Equation Type
A hyperbola with a horizontal transverse axis has the general equation: \( \frac{(x-h)^2}{a^2} - \frac{(y-k)^2}{b^2} = 1 \), where \((h, k)\) is the center.
02
Determine the Center
Given that the center of the hyperbola is \((2,3)\), we know \(h = 2\) and \(k = 3\). So, the equation begins as: \( \frac{(x-2)^2}{a^2} - \frac{(y-3)^2}{b^2} = 1 \).
03
Calculate 'a', the Distance from Center to Vertex
The vertex is given as \((3,3)\), which implies that the vertex lies one unit to the right of the center. Thus, \(a = 1\).
04
Find 'c', the Distance from Center to Focus
Since one focus is \((0,3)\), the distance from the center \((2,3)\) to this focus is \(c = 2\).
05
Calculate 'b' Using the Relationship
For hyperbolas, the relationship is \( c^2 = a^2 + b^2 \). Substituting the known values, we have \(2^2 = 1^2 + b^2\). Thus, \(4 = 1 + b^2\), which gives \(b^2 = 3\).
06
Write the Final Equation
Substitute \(a^2 = 1\) and \(b^2 = 3\) into the hyperbola equation. The final equation is: \( \frac{(x-2)^2}{1} - \frac{(y-3)^2}{3} = 1 \), or simplified as \( (x-2)^2 - \frac{(y-3)^2}{3} = 1 \).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Equation of Hyperbola
The equation of a hyperbola plays a crucial role in defining its shape and orientation. The standard form of a hyperbola's equation with a horizontal transverse axis is:\[ \frac{(x-h)^2}{a^2} - \frac{(y-k)^2}{b^2} = 1 \]In this equation:
- \((h, k)\) represents the center of the hyperbola
- \(a\) is the distance from the center to each vertex along the transverse axis
- \(b\) relates to the distance along the conjugate axis, which does not determine the location of real parts like vertices and foci
Center of Hyperbola
The center of a hyperbola is the midpoint between its vertices and is also equidistant from its foci. In a coordinate plane, the center helps in determining the pivotal point around which the hyperbola is oriented.For the given problem, the center was provided at \((2,3)\). Knowing the center plays a key role in writing the hyperbola's equation. The coordinates \((h, k)\) are plugged into the hyperbola equation so that:\[ \frac{(x-2)^2}{a^2} - \frac{(y-3)^2}{b^2} = 1 \]Here,
- \(h = 2\) and \(k = 3\) help define the equation's location on the plane
- Everything else revolves around this reference point
Vertex and Focus of Hyperbola
Vertices and foci are pivotal elements in the structure of a hyperbola.- **Vertex:** A vertex of a hyperbola is a point where it makes its sharpest turn. The vertices lie along the transverse axis, defining the real AND visible 'arms' of the hyperbola. In the problem, a vertex is provided at \((3,3)\). This means it is 1 unit from the center \((2,3)\). Thus, we identify \(a = 1\).- **Focus:** The focus of a hyperbola is a point located inside each 'arm'. It helps determine the curve's extent of deviation. For this exercise, a focus is given at \((0,3)\). The distance from the center \((2,3)\) to this focus is \(c = 2\).Both these elements are used to further solve or establish the hyperbola's shape using the formula:\[ c^2 = a^2 + b^2 \]Substituting the known values, we found \(b^2 = 3\). Together, these elements contribute to the hyperbola's overall equation and give insight into its graphical representation.