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College Algebra
Conic Sections

1
The Parabola

Problem  1
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Consider the parabola with vertex at the origin defined by the equation \(y=\dfrac{1}{6}x^2\)

  1. Find the coordinates of the focus.

  2. Find the equations of the directrix and the axis of symmetry.

  3. Find the value(s) of \(a\) for which the point \((a,4)\) is on the parabola.

  4. Sketch the parabola, and indicate the focus and the directrix.

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Stephanie cc
Stephanie
Nathan cc
Nathan
Julieta cc espanol spanish
Julieta
Problem  2

Determine the equation in standard form of the parabola with vertex at the origin and directrix \(x=3\). Sketch the parabola, and indicate the focus and the directrix.

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Stephanie cc
Stephanie
Nathan cc
Nathan
Julieta cc espanol spanish
Julieta
Problem  3

Determine the equation in standard form of the parabola with directrix \(y=7\) and focus at \((-3,3)\). Sketch the parabola.

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Stephanie cc
Stephanie
Breylor cc
Breylor
Julieta cc espanol spanish
Julieta
Problem  4

Find the vertex and focus of the parabola \[-4x+3y^2+12y-8=0\] Determine the equation of the directrix and sketch the parabola.

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Stephanie cc
Stephanie
Breylor cc
Breylor
Problem  5

The cross-section of a headlight reflector is in the shape of a parabola. The reflector is \(6\) inches in diameter and \(5\) inches deep, as illustrated in Figure 15.

  1. Find an equation of the parabola, using the position of the vertex of the parabola as the origin of your coordinate system.

  2. The bulb for the headlight is positioned at the focus. Find the position of the bulb.

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Shelby cc
Shelby
Nathan cc
Nathan
Julieta cc espanol spanish
Julieta

2
The Ellipse

Problem  1
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Consider the ellipse that is centered at the origin and defined by the equation \(16x^2+25y^2=400\)

  1. Write the equation of the ellipse in standard form, and determine the orientation of the major axis.

  2. Find the coordinates of the vertices and the foci.

  3. Sketch the ellipse, and indicate the vertices and foci.

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Shelby cc
Shelby
Nathan cc
Nathan
Julieta cc espanol spanish
Julieta
Problem  2
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Determine the equation in standard form of the ellipse with center at the origin, one focus at \(\left(0, -\dfrac{3}{2}\right)\), and one vertex at \((0,2)\). Sketch the ellipse.

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Shelby cc
Shelby
Nathan cc
Nathan
Julieta cc espanol spanish
Julieta
Problem  3

Determine the equation in standard form of the ellipse with foci at \((4,1)\) and \((4, -5)\) and one vertex at \((4, 3)\). Sketch the ellipse.

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Saba cc
Saba
Nathan cc
Nathan
Julieta cc espanol spanish
Julieta
Problem  4

Write the equation in standard form of the ellipse defined by the equation \[5x^2-30x+25y^2+50y+20=0\] Sketch the ellipse.

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Saba cc
Saba
Nathan cc
Nathan
Julieta cc espanol spanish
Julieta
Problem  5

The orbit of Halley’s comet is elliptical, with the sun at one of the foci. The length of the major axis of the orbit is approximately \(36\) astronomical units (AU), and the length of the minor axis is approximately \(9\) AU \((1 \text{ AU} \approx 92\text{,}600\text{,}000 \text{ miles})\). Find the equation in standard form of the path of Halley’s comet, using the origin as the center of the ellipse and a segment of the \(x\)-axis as the major axis.

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Saba cc
Saba
Nathan cc
Nathan
Julieta cc espanol spanish
Julieta

3
The Hyperbola

Problem  1
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Consider the hyperbola that is centered at the origin and defined by the equation \(16x^2-9y^2=144\)

  1. Write the equation of the hyperbola in standard form, and determine the orientation of the transverse axis.

  2. Find the equations of the asymptotes.

  3. Sketch the hyperbola, and indicate the vertices, foci, and asymptotes.

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Stephanie cc
Stephanie
Breylor cc
Breylor
Julieta cc espanol spanish
Julieta
Problem  2
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Determine the equation in standard form of the hyperbola with center at \((0,0)\), one focus at \((0,4)\), and one vertex at \((0,-1)\). Find the other focus and the other vertex. Sketch a graph of the hyperbola by finding and plotting some additional points that lie on the hyperbola.

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Stephanie cc
Stephanie
Breylor cc
Breylor
Julieta cc espanol spanish
Julieta
Problem  3
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Determine the equation in standard form of the hyperbola with foci at \((4,3)\) and \((4,-7)\) and a transverse axis of length \(6\). Find the asymptotes and sketch the hyperbola.

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Stephanie cc
Stephanie
Breylor cc
Breylor
Julieta cc espanol spanish
Julieta
Problem  4
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Write the equation in standard form of the hyperbola defined by the equation \[x^2-4y^2+2x-24y=39\] Find the vertices and the foci, and sketch the hyperbola.

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Stephanie cc
Stephanie
Breylor cc
Breylor
Julieta cc espanol spanish
Julieta
Problem  5

The front face of a wire frame sculpture is in the shape of the branches of a hyperbola that opens to the side. The transverse axis of the hyperbola is \(40\) inches long. If the base of the sculpture is \(60\) inches below the transverse axis and one of the asymptotes has a slope of \(\dfrac{3}{2}\), how wide is the sculpture at the base?

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Stephanie cc
Stephanie
Breylor cc
Breylor
Julieta cc espanol spanish
Julieta

4
Test & Summary

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