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Ch. 1 - Functions
Briggs - Calculus: Early Transcendentals 3rd Edition
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243Non è quello che usi tu?Cambia libro di testo
Capitolo 1, Problema 29c

Graphing equations Graph the following equations. 


c. x² + 2x + y² + 4y + 1 = 0

Guida verificata passo dopo passo
1
Step 1: Recognize that the given equation is a conic section. The equation x^2 + 2x + y^2 + 4y + 1 = 0 is a quadratic equation in x and y, which suggests it could represent a circle, ellipse, parabola, or hyperbola.
Step 2: Complete the square for the x terms. Start with x^2 + 2x. To complete the square, take the coefficient of x, which is 2, divide it by 2 to get 1, and then square it to get 1. Add and subtract this square inside the equation: x^2 + 2x + 1 - 1.
Step 3: Complete the square for the y terms. Similarly, take the y terms y^2 + 4y. Take the coefficient of y, which is 4, divide it by 2 to get 2, and then square it to get 4. Add and subtract this square inside the equation: y^2 + 4y + 4 - 4.
Step 4: Rewrite the equation using the completed squares. The equation becomes (x + 1)^2 - 1 + (y + 2)^2 - 4 + 1 = 0. Simplify this to get (x + 1)^2 + (y + 2)^2 = 4.
Step 5: Identify the graph of the equation. The equation (x + 1)^2 + (y + 2)^2 = 4 is the equation of a circle with center at (-1, -2) and radius 2.

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Conic Sections

Conic sections are the curves obtained by intersecting a plane with a double-napped cone. The equation given represents a conic section, specifically a circle or an ellipse, depending on the coefficients of the variables. Understanding how to identify and graph these shapes is essential for solving the problem.
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Completing the Square

Completing the square is a method used to transform a quadratic equation into a perfect square trinomial. This technique simplifies the process of graphing by allowing us to rewrite the equation in vertex form, making it easier to identify the center and radius of the conic section.
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Trig Values in Quadrants II, III, & IV Example 1

Graphing Techniques

Graphing techniques involve plotting points and understanding the shape of the graph based on the equation. For conic sections, knowing how to find key features such as vertices, axes of symmetry, and intercepts is crucial for accurately representing the graph on a coordinate plane.
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