Directrix of conic
The value of Determine the eccentricity of the hyperbola described by the equationFirst find the values of a and b, then determine c using the equation \(c^2=a^2+b^2\).Sometimes it is useful to write or identify the equation of a conic section in polar form. The vertex of the right branch has coordinates \((a,0),\) soThis equation is therefore true for any point on the hyperbola. Download for free at \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)[ "article:topic", "directrix", "discriminant", "nappes", "focus", "Hyperbolas", "Ellipses", "Parabola", "CONIC SECTIONS", "major axis", "minor axis", "eccentricity", "vertex", "focal parameter", "general form", "nappe", "standard form", "license:ccbyncsa", "showtoc:no", "authorname:openstaxstrang" ][ "article:topic", "directrix", "discriminant", "nappes", "focus", "Hyperbolas", "Ellipses", "Parabola", "CONIC SECTIONS", "major axis", "minor axis", "eccentricity", "vertex", "focal parameter", "general form", "nappe", "standard form", "license:ccbyncsa", "showtoc:no", "authorname:openstaxstrang" ]\( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)Example \(\PageIndex{1}\): Converting the Equation of a Parabola from General into Standard FormExample \(\PageIndex{2}\): Finding the Standard Form of an EllipseExample \(\PageIndex{3}\): Finding the Standard Form of a HyperbolaExample \(\PageIndex{4}\): Determining Eccentricity of a Conic SectionExample \(\PageIndex{5}\): Graphing a Conic Section in Polar CoordinatesExample \(\PageIndex{6}\): Identifying a Rotated Conic11.E: Parametric Equations and Polar Coordinates (Exercises) So that's (a,b) is the focus. Determine whether the directrix is horizontal or vertical. Since the first set of parentheses has a 9 in front, we are actually adding 36 to the left-hand side.
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