DISCUSS: A Family of Confocal Conics Conics that share a focus are called confocal. Consider the family of conics that have a focus at
(a) Find equations of two different ellipses that have these properties.
(b) Find equations of two different hyperbolas that have these properties.
(c) Explain why only one parabola satisfies these properties. Find it’s equation.
(d) Sketch the conics you found in parts (a),(b), and (c) on the same coordinate axes (for the hyperbolas, sketch top branches only).
(e) How are the ellipses and hyperbolas related to the parabola?
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Chapter 12 Solutions
EBK ALGEBRA AND TRIGONOMETRY
- aUse the discriminant to determine whether the graph of the following equation is a parabola, an ellipse, or a hyperbola: 5x2+4xy+2y2=18 b Use rotation of axes to eliminate the xy-term in the equation. c Sketch a graph of the equation. d Find the coordinates of the vertices of this conic in the xy-coordinate system.arrow_forwardDISCUS: A Family of Confocal Conics Conics that share a focus are called confocal. Consider the family of conics that have a focus at (0, 1) and a vertex at the origin, as shown in the figure. Find equations of two different ellipses that have these properties. Find equations of two different hyperbolas that have these properties. Explain why only one parabola satisfies these properties. Find its equation. Sketch the conics you found in parts (a), (b), and (c) on the same coordinate axes (for the hyperbolas, sketch the top branches only). How are the ellipses and hyperbolas related to the parabola?arrow_forwardIn your own words, define a hyperbola and write the equation of a hyperbola centered at the origin in standard form. Draw a sketch of the hyperbola labeling the center, vertices, and asymptotes.arrow_forward
- Find the standard form of the equation of the ellipse with vertices(0,2) and (8,2) and minor axis of length 4. Then find the eccentricity of the ellipse.arrow_forwardFind the standard form of the equation of the hyperbola with vertices 2,4 and 2,2 and foci 2,5 and 2,3.arrow_forwardFind the equation of the ellipse shown.arrow_forward
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