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An hyperbola is the set of all points whose distances to two fixed points subtract to the same constant. In this section, we will focus on the equation of hyperbolas. The axis that contains the vertices is called the transverse axis and the axis that does not contain the vertices is called the conjugate axis.
Also notice that the shape is very different than that of a parabola, hyperbolas are asymptotic to the following lines: To easily graph the asymptotes of a hyperbola use the following process.
Identify the center h, k from standard form. Plot points a units left and right from center. Plot points b units up and down from center. Draw the rectangle defined by these points.
The lines though the corners of this rectangle are the asymptotes! Finally use the equation to determine if the parabola is vertical or horizontal. Compare this hyperbola to the previous and note the difference in standard form. The rectangle and asymptotes are not actually part of the graph.
We use these to obtain a more accurate sketch. When graphed on a graphing utility the result looks like this. Graph the hyperbola and give the equations of the asymptotes. The next examples require us to complete the square to obtain standard form.
Graph the hyperbola, x- and y- intercepts, and give the equations of the asymptotes.
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When we completed the square, notice that we added 64 and subtracted to balance the equation. It may appear, at first glance, that we added 16 and 25 to the left side. But in reality, after we distribute the 4 and -9 we added and subtracted larger values.
When the transverse axis is vertical be careful with the center. A common error is to use -2, 1 for the center in the above example because the y variable comes first and we are used to reading these from left to right. This would be incorrect so take care to use the correct h and k.
Find the equation of the hyperbola with vertices 3,0 and -3,0horizontal transverse axis, and conjugate axis of length 4 units. Find the equation of the hyperbola with center 2, -5vertical transverse axis measuring 10 units, and conjugate axis measuring 6 units.
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