8.5 Graph and Write Equations of Hyperbolas p.518 What are the parts of a hyperbola? What are the standard form equations of a hyperbola?
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1 8.5 Graph and Write Equations of Hyperbolas p.518 What are the parts of a hyperbola? What are the standard form equations of a hyperbola? How do you know which way it opens? Given a & b, how do you find the value of c? How do you graph a hyperbola? Why does drawing a box make graphing easier? How do you write the equation from a graph?
2 Hyperbolas Like an ellipse but instead of the sum of distances it is the difference A hyperbola is the set of all points P such that the differences from P to two fixed points, called foci, is constant The line thru the foci intersects the two points (the vertices) The line segment joining the vertices is the transverse axis, and it s midpoint is the center of the hyperbola. Has branches and asymptotes The asymptotes contain the diagonals of a rectangle centered at the hyperbolas center
3 Asymptotes Vertex (-a,0) (0,b) Vertex (a,0) Focus Focus (0,-b)
4 Vertical transverse axis
5 Standard Form of Hyperbola w/ origin Transverse Equation Asymptotes Vertices Axis Horizontal (± a,0) Vertical (0,± a) Foci lie on transverse axis, c units from the center c = a+b
6 Graph 4x 9y = 36 Write in standard form (divide through by 36) a=3 b= because x term is + transverse axis is horizontal & vertices are (-3,0) & (3,0) Draw a rectangle centered at the origin. Draw asymptotes. Draw hyperbola.
7 x y + =1 9 4 a= b=
8 Graph 5y 4x = 100. Identify the vertices, foci, and asymptotes of the hyperbola. SOLUTION STEP 1 Rewrite the equation in standard form. 5y 4x = 100 5y 100 y 4 STEP Write original equation. 4x 100 Divide each side by 100. = x Simplify. = 1 5 Identify the vertices, foci, and asymptotes. Note that a = 4 and b = 5, so a = and b = 5. The y - term is positive, so the transverse axis is vertical and the vertices are at (0, +). Find the foci. c = a + b = + 5 = 9. so c = 9. The foci are at ( 0, + 9. ) (0, + 5.4).
9 The asymptotes are y = + a x or y = + x 5 b STEP 3 Draw the hyperbola. First draw a rectangle centered at the origin that is a = 4 units high and b = 10 units wide. The asymptotes pass through opposite corners of the rectangle. Then, draw the hyperbola passing through the vertices and approaching the asymptotes.
10 Graph the equation. Identify the vertices, foci, and asymptotes of the hyperbola. y x = 1 SOLUTION y x STEP 1 The equation is in standard form = 1 STEP Identify the vertices, foci, and asymptotes. Note that a = 16 and b = 49, so a = 4 and b = 7. The x - term is positive, so the transverse axis is horizontal and the vertices are at (+4, 0). Find the foci. c = a + b = = 65. so c = The foci are at ( + 65, 0 )
11 STEP 3 Draw the hyperbola. First draw a rectangle centered at the origin that is a = 8 units wide and b = 14 units high. The asymptotes pass through opposite corners of the rectangle. Then, draw the hyperbola passing through the vertices and approaching the asymptotes.
12 Write the equation of a hyperbola with foci (0,-3) & (0,3) and vertices (0,-) & (0,). Vertical because foci & vertices lie on the y-axis origin because focus & vertices are equidistant from the origin Since c=3 & a=, c = b + a 9 = b = b ± 5 = b
13 Write an equation of the hyperbola with foci at ( 4, 0) and (4, 0) and vertices at ( 3, 0) and (3, 0). SOLUTION The foci and vertices lie on the x-axis equidistant from the origin, so the transverse axis is horizontal and the center is the origin. The foci are each 4 units from the center, so c = 4. The vertices are each 3 units from the center, so a = 3.
14 Because c = a + b, you have b = c a. Find b. b = c a = 4 3 = 7 Because the transverse axis is horizontal, the standard form of the equation is as follows: y x 3 7 y x 9 7 = 1 = 1 Substitute 3 for a and 7 for b. Simplify
15 Write an equation of the hyperbola with the given foci and vertices. The foci and vertices lie on the x-axis equidistant from Foci: ( 3, 0), (3, 0) Vertices: ( 1, 0), (1, 0) the origin, so the transverse axis is horizontal and the SOLUTION center is the origin. The foci are each 3 units from the center, so c = 3. The vertices are each 1 units from the center, so a = 1. Because c = a + b, you have b = c a. Find b. b = c a = 3 1 = 8 Because the transverse axis is horizontal, the standard form of the equation is as follows: x 1 x y 8 y 8 = 1 = 1 Substitute 1 for a and 8 for b. Simplify
16 Your turn: Write an equation of the hyperbola with the given foci and vertices. Foci: (0, 10), (0, 10) Vertices: (0, 6), (0, 6) The foci and vertices lie on the y-axis equidistant from the origin, so the transverse axis is vertical and the center is the origin. The foci are each 10 units from the center, so c = 10. The vertices are each 6 units from the center, so a = 6. Because c = a + b, you have b = c a. Find b. b = c a = 10 6 = 64 SOLUTION Because the transverse axis is horizontal, the standard form of the equation is as follows: x y 6 64 = 1 x y = Substitute 6 for a and 64 for b. Simplify
17 Photography You can take panoramic photographs using a hyperbolic mirror. Light rays heading toward the focus behind the mirror are reflected to a camera positioned at the other focus as shown. After a photograph is taken, computers can unwrap the distorted image into a 360 view cm.81 cm Write an equation for the cross section of the mirror. The mirror is 6 centimeters wide. How tall is it? a = center to vertex b=? c = center to focus
18 SOLUTION From the diagram, a =.81 and c = STEP 1 To write an equation, find b. b = c a = Because the transverse axis is vertical, the standard form of the equation for the cross section of the mirror is as follows: y y x x = 1 or = STEP Find the y-coordinate at the mirror s bottom edge. Because the mirror is 6 centimeters wide, substitute x = 3 into the equation and solve. y y 0.83 = 1 Substitute 3 for x. Solve for y. Solve for y. y 4.56 So, the mirror has a height of.81 ( 4.56) = 1.75 cm.
19 What are the parts of a hyperbola? Vertices, foci, center, transverse axis & asymptotes What are the standard form equations of a hyperbola? How do you know which way it opens? Transverse axis is always over a Given a & b, how do you find the value of c? c = a + b How do you graph a hyperbola? Plot a and b, draw a box with diagonals. Draw the hyperbola following the diagonals through the vertices.
20 Why does drawing a box make graphing easier? The diagonals of the box are the asymptotes of the hyperbola. How do you write the equation from a graph? Identify the transverse axis, find the value of a and b (may have to use c = a + b) and substitute into the equation.
21 Hw 8.5 Page 51 #3-11, 18-5 AND Page 531 #5, 6, 11, 19, 0
22 POD HAND IN WHEN FINISHED 1. Graph: 5y - 64x = Write an eqn. of a hyperbola with foci at (±8,0) and vertices at (±5,0)
23 8.5 Hyperbolas, day What are the standard form equations of a hyperbola if the center has been translated? How do you graph a translated hyperbola? How do you write the equation of a translated hyperbola?
24 Translated Hyperbolas In the following equations the point (h,k) is the center of the hyperbola. Horizontal axis Vertical axis Remember c = a + b
25 Graphing the Equation of a Translated Hyperbola (x + 1) Graph (y + 1) = 1. 4 ( 1, 0) SOLUTION The y -term is positive, so the transverse axis is vertical. Since a = 1 and b = 4, you know that a = 1 and b =. ( 1, 1) ( 1, ) Plot the center at (h, k) = ( 1, 1). Plot the vertices 1 unit above and below the center at ( 1, 0) and ( 1, ). Draw a rectangle that is centered at ( 1, 1) and is a = units high and b = 4 units wide.
26 Graphing the Equation of a Translated Hyperbola (x + 1) Graph (y + 1) = 1. 4 ( 1, 0) SOLUTION The y -term is positive, so the transverse axis is vertical. Since a = 1 and b = 4, you know that a = 1 and b =. ( 1, 1) ( 1, ) Draw the asymptotes through the corners of the rectangle. Draw the hyperbola so that it passes through the vertices and approaches the asymptotes.
27 (y 3) (x + 1) Graph = SOLUTION STEP 1 Compare the given equation to the standard forms of equations of hyperbolas. The equation s form tells you that the graph is a hyperbola with a vertical transverse axis. The center is at (h, k) = ( 1, 3). Because a = 4 and b = 9, you know that a = and b = 3. STEP Plot the center, vertices, and foci. The vertices lie a = units above and below the center, at (1, 5) and (1, 1). Because c = a + b = 13, the foci lie c = units above and below the center, at ( 1, 6.6) and ( 1, 0.6).
28 STEP 3 Draw the hyperbola. Draw a rectangle centered at (1, 3) that is a = 4 units high and b = 6 units wide. Draw the asymptotes through the opposite corners of the rectangle. Then draw the hyperbola passing through the vertices and approaching the asymptotes.
29 3. Graph (y 4) (x + 3) = 9 1 SOLUTION STEP 1 Compare the given equation to the standard forms of equations of hyperbolas. The equation s form tells you that the graph is a hyperbola with a vertical transverse axis. The center is at (h, k) = ( 3, 4). Because a = 1 and b = 4, you know that a = 1 and b =. STEP Plot the center, vertices, and foci. The vertices lie a = 1 units above and below the center, at (, 4) and ( 4, 4). Because c = a + b = 5, the foci lie c = 5 units above and below the center, at ( 3 + 5,4 ) and ( 3, 5, 4).
30 STEP 3 Draw the hyperbola. Draw a rectangle centered at ( 3, 4) that is a = units high and b = 4 units wide. Draw the asymptotes through the opposite corners of the rectangle.
31 Write the equation of the hyperbola in standard form. 16y 36x + 9 = 0 16y 36x = 9
32 Write an equation for the hyperbola. Vertices at (5, 4) and (5,4) and foci at (5, 6) and (5,6). Draw a quick graph. Equation will be:
33 (5,6) (5,4) Center (5,0) (h,k) a = 4, c = 6 c =a +b 6 = 4 + b 36 = 16 + b 0 = b Center? (5, 4) (5, 6)
34 Write an equation for the hyperbola. Vertices at (-5, ) and (7,) and foci at (1-45,) and (1+ 45,). Draw a quick graph. Equation will be:
35
36 What are the standard form equations of a hyperbola if the center has been translated?
37 Hw 8.5 Page 51 #3-11, 18-5 AND Page 531 #5, 6, 11, 19, 0
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