Ch. 7 - Conic Sections

Blitzer8th EditionCollege AlgebraISBN: 9780136970514Non è quello che usi tu?Cambia libro di testo

Blitzer 8th Edition

Ch. 7 - Conic Sections

Problema 53

Capitolo 8, Problema 53

Convert each equation to standard form by completing the square on x and y. Then graph the ellipse and give the location of its foci. 9x² + 16y² – 18x + 64y – 71 = 0

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Start with the given equation: $9x^{2} + 16y^{2} - 18x + 64y - 71 = 0$.

Group the $x$ terms and $y$ terms together: $9x^{2} - 18x + 16y^{2} + 64y = 71$.

Factor out the coefficients of the squared terms from each group: $9(x^{2} - 2x) + 16(y^{2} + 4y) = 71$.

Complete the square for each group inside the parentheses: - For $x^{2} - 2x$, take half of $-2$ which is $-1$, square it to get $1$, so add and subtract $1$ inside the parentheses. - For $y^{2} + 4y$, take half of $4$ which is $2$, square it to get $4$, so add and subtract $4$ inside the parentheses.

Rewrite the equation including the completed squares and adjust the right side accordingly: $9(x^{2} - 2x + 1 - 1) + 16(y^{2} + 4y + 4 - 4) = 71$. Then express the perfect square trinomials as squares: $9((x - 1)^{2} - 1) + 16((y + 2)^{2} - 4) = 71$. Finally, distribute and move constants to the right side to isolate the squared terms.

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Completing the Square

Completing the square is a method used to rewrite quadratic expressions in the form (x - h)² or (y - k)² by adding and subtracting appropriate constants. This technique helps transform the given equation into a standard form, making it easier to identify the center and dimensions of conic sections like ellipses.

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Solving Quadratic Equations by Completing the Square

Standard Form of an Ellipse

The standard form of an ellipse equation is (x - h)²/a² + (y - k)²/b² = 1, where (h, k) is the center, and a and b are the lengths of the semi-major and semi-minor axes. Converting to this form allows for straightforward graphing and analysis of the ellipse's properties.

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Graph Ellipses at Origin

Foci of an Ellipse

The foci are two fixed points inside an ellipse such that the sum of the distances from any point on the ellipse to the foci is constant. Their locations depend on the values of a, b, and the center, and are found using the relationship c² = |a² - b²|, where c is the distance from the center to each focus.

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Foci and Vertices of an Ellipse

Pratica correlata

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