Conics A conic section is a graph that results from the intersection of a plane and a double cone.

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Presentation transcript:

Conics A conic section is a graph that results from the intersection of a plane and a double cone.

A parabola is the set of all points that are equidistant from a line (the directrix) and a point (the focus). The vertex is the midpoint between the focus and directrix, and the axis is the line through focus and vertex.

A parabola with vertex (0,0) and directrix y = -p has the equation x2 = 4py A parabola with vertex (0,0) and directrix x = -p has the equation y2 = 4px

Ex. Find the focus of the parabola y = -2x2.

Ex. Find the equation of the parabola with vertex at the origin and focus at (2,0).

An ellipse is the set of all points, the sum of whose distances from two points (foci) is constant. The major axis goes through the foci, the minor axis is perpendicular to the major axis at the center.

An ellipse centered at (0,0) with horizontal axis length 2a and vertical axis length 2b has equation The vertices and foci lie on the major (longer) axis. The foci lie c units from the center, where c2 = a2 – b2.

Ex. Sketch a graph of the ellipse 4x2 + y2 = 36, and identify the vertices and foci.

Ex. Find the equation of the ellipse shown below.

A hyperbola is the set of all points, the difference of whose distances from two points (foci) is constant. The transverse axis is the line connecting the vertices, and the midpoint of the transverse axis is the center.

A hyperbola centered at (0,0) with a horizontal transverse axis has equation A hyperbola centered at (0,0) with a vertical transverse axis has equation The foci lie c units from the center, where c2 = a2 + b2.

Ex. Sketch a graph of the hyperbola 4x2 – y2 = 16, and identify the foci.

Ex. Find the equation of the hyperbola shown below.

Ex. Identify and graph

Ex. Identify and graph

Ex. Identify and graph (x + 3)2 + (y – 2)2 = 16

Ex. Find the vertex and focus of the parabola x2 – 2x + 4y – 3 = 0

Ex. Sketch x2 + 4y2 + 6x – 8y + 9 = 0

Ex. Sketch -4x2 + y2 + 24x + 4y – 41 = 0

Ex. The vertices of an ellipse are (2,-2) and (2,4), and the length of the minor axis is 4. Find the equation of the ellipse.