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An Ellipse Centered at the Origin In Exercises \(9-18\) , find the standard form of the equation of the ellipse with the given characteristics and center at the origin. Vertices: \((0, \pm 5) ;\) passes through the point \((4,2)\)

Short Answer

Expert verified
The standard form of the equation of the ellipse is \(3x^2/25 + y^2/25 = 1\).

Step by step solution

01

Identify and Plug in the given Vertices in the Standard Elliptic equation

The given vertices are at (0, ±5) are on y–axis. Hence, 'b' is 5. And the form of equation of the ellipse will be \(x^2/a^2 + y^2/25 = 1\)
02

Substitute a Point (x, y) into the equation

Next, substitute the given point (4, 2) into the new equation. This will allow to find the value 'a'. So, \( (4)^2/a^2 + (2)^2/25 = 1\). Simplify this equation to isolate a^2
03

Solve for 'a'

Solving the equation in Step 2 gives \(a^2 = 25/3\).
04

Write the Final Equation of the Ellipse

Substitute 'a' and 'b' into the standard equation of the ellipse. Thus, the equation of the ellipse becomes \(x^2/(25/3) + y^2/25 = 1\), which can be simplified to \(3x^2/25 + y^2/25 = 1\)

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Standard Form of Ellipse
Ellipses are intriguing curves with distinct mathematical properties. The standard form of an ellipse’s equation helps us understand its geometric attributes better. For an ellipse centered at the origin, the equation generally looks like:\[\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1\]Where:- \(a\) and \(b\) are the lengths of the semi-axes.- \(a^2\) is always paired with the \(x^2\) term if the major axis is horizontal, and with \(y^2\) if it’s vertical. In our problem, we are given that the vertices are at points \((0, \pm 5)\). Since these vertices lie on the y-axis, the semi-major axis is vertical, making \(b = 5\). Thus, \(b^2 = 25\). This initial step frames the way we develop the rest of the equation. Subsequent steps will involve placing the known points into this standard form to determine other unknown quantities, like \(a\). This process elucidates the symmetry and shape of our specific ellipse.
Vertices of Ellipse
Understanding the vertices of an ellipse provides insights into its size and orientation. Typically, vertices are the endpoints of the axes that define an ellipse's longest and shortest diameters.In our specific exercise, the vertices are located at \((0, \pm 5)\), indicating a vertical orientation. This implies that the semi-major axis, which affects the value of \(b\) in our equation, is oriented along the y-axis, while the x-axis encompasses the semi-minor axis. Thus, \(b = 5\) captures the greatest reach of the ellipse vertically. In essence:- The vertices are found at points \( (0, b) \) and \( (0, -b) \) for a vertically oriented ellipse.- These points are crucial as they help determine the coefficient of the \(y^2\) component in the standard form equation.Recognizing the vertices early on helps streamline the process of configuring the complete equation by setting the stage for solving other parameters, like \(a^2\).
Ellipse Centered at Origin
An ellipse centered at the origin follows a predictable pattern in equation form, greatly simplifying many calculations. When centered at the origin, as most introductory problems tend to be, the equation takes a streamlined format. Given the familiarity of these coordinates, understanding becomes more direct and well-structured. Here:- The equation is centered around (0, 0), meaning that the center point coordinates vanish, emphasizing symmetry in solutions.- Each point on the ellipse adheres to the relationship established in the standard equation format, with each axis running through the center.The given point \((4, 2)\) assists in verifying and refining our elliptical equation, ensuring that it accurately represents the desired geometric shape. By plugging this point into our form, we discover necessary values like \(a\), systematically and methodically building out the equation from the center point outward.Understanding this central positioning reinforces the fundamental geometric principles underpinning ellipses, making future equations and alterations straightforward.

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Most popular questions from this chapter

The sound pickup pattern of a microphone is modeled by the polar equation \(r=5+5 \cos \theta\) where \(|r|\) measures how sensitive the microphone is to sounds coming from the angle \(\theta\) . (a) Sketch the graph of the model and identify the type of polar graph. (b) At what angle is the microphone most sensitive to sound?

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