Math Problem Statement

Write the standard equation of ellipse with the given features. Ends of major axis (0,±9), and ends of minor axis (±3,0)

Solution

The given problem asks to find the standard equation of an ellipse, where:

  • The ends of the major axis are (0,±9)(0, \pm 9).
  • The ends of the minor axis are (±3,0)(\pm 3, 0).

From this information, we can conclude the following:

  1. Center of the Ellipse: Since the axes are centered on the origin and the given points are symmetric about the origin, the center of the ellipse is (0,0)(0, 0).

  2. Length of the Major Axis: The major axis runs vertically (because the yy-coordinates vary more). The distance from the center to the endpoints of the major axis is 9. Therefore, the length of the semi-major axis a=9a = 9.

  3. Length of the Minor Axis: The minor axis runs horizontally (since the xx-coordinates vary in the minor axis points). The distance from the center to the endpoints of the minor axis is 3. Therefore, the length of the semi-minor axis b=3b = 3.

Standard Equation of an Ellipse:

The standard form of the equation for an ellipse with a vertical major axis is:

x2b2+y2a2=1\frac{x^2}{b^2} + \frac{y^2}{a^2} = 1

Substituting a=9a = 9 and b=3b = 3:

[ \frac{x^2}{3^2} + \frac{y^2}{9^2} = 1 \

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Math Problem Analysis

Mathematical Concepts

Analytic Geometry
Conic Sections
Ellipse

Formulas

Standard equation of ellipse: (x^2 / b^2) + (y^2 / a^2) = 1 for a vertical major axis

Theorems

Properties of ellipses related to their axes and foci

Suitable Grade Level

Grades 10-12