Conic Sections: Parabola, Ellipse, and...
Transcript of Conic Sections: Parabola, Ellipse, and...
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Calculus II Section 10.1 Notes
Conic Sections: Parabola, Ellipse, and Hyperbola
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2
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Equations of Parabola:
1) Parabola opens up: 4
vertex = , ; focus = , ; directrix:
2) Parabola opens down: 4
vertex = , ; focus = , ; directrix:
x h p y k
h k h k p y k p
x h p y k
h k h k p y k
2
2
3) Parabola opens right: 4
vertex = , ; focus = , ; directrix:
4) Parabola opens left: 4
vertex = , ; focus = , ; directrix:
p
y k p x h
h k h p k y h p
y k p x h
h k h p k y h p
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2
2
Let 8 . Find vertex, focus, and directrix.
Stander Form: 0 = 4 2 0
Parabola opens to the right
2
a) Find the vertex: , = 0, 0
b) Find the focus: , = 0+2, 0
c) Find the directrix: 0
y x
y x
p
h k
h p k
x h p x
2 2
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2
2
2
2
Let 8 12 . Find vertex, focus, and directrix.
Half of -8 = -4; -4 =16
Add 16 to both sides:
8 16 12 16
4 4 12( 16 /12)
4 4 3( 4 / 3) Parabola opens to the right
3
a) Find the vertex: ,
y y x
y y x
y y x
y x
p
h
= -4/3, 4
b) Find the focus: , = -4/3+3, 4
c) Find the directrix: 4 / 3 3
k
h p k
x h p x
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2
2
2
2
2
Find vertex, focus, and directrix for +4 4 10 0.
+4 4 10 Rearrange equation
Note: half of 4 = 2; 2 4; add 4 to both sides of equation
+4 4 4 10 4
2 2 = 4 14
2 = 4
x x y
x x y
x x y
x x y
x
2
14 / 4
2 = 4 1 7 / 2 Parabola opens down
1
a) Find the vertex: , = -2, 7/2
b) Find the focus: , = -2, 7/2-1
c) Find the directrix: 7/2+1
y
x y
p
h k
h k p
y k p y
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Find an equation of the parabola that has the following
vertex and focus: vertex: (4, 7) ; focus: (1, 7)
Note: Parabola opens left.
3 distance from vertex to focus
Equation of parabola: 4
p
y k p x
2
2
7 4 3 4
7 12 4
h
y x
y x
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Find an equation of the parabola that has the following
vertex and directrix: vertex: (5, 3) ; directrix: 1
: Parabola opens to the right.
4 distance from vertex to directrix
Equation of
x
Note
p
2
2
2
parabola: 4
3 4 4 5
3 16 5
y k p x h
y x
y x
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2 2 2
2 2
2 2
2 2
2 2
Ellipse Equations
1 ; Elongated Horizontally
1; Elongated Vertically
a b c
x h y ka b
a b
x h y ka b
b a
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22
2 2
2 2 2 2 2
22
41
9 25
25; 5; 9; 3
25 9 =16 4
Note: is under 4 ; ellipse elongates vertically
a) Find the center of the ellipse: , 0,4
b) Find the vertice
yx
a a b b
a b c c c c
a y
h k
s: , 0,4 5
c) Find the foci: , 0,4 4
h k a
h k c
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2 2
2 2
2 2 2 2 2
22
2 31
25 12
25; 5; 12; 12
25 12 =13 13
Note: is under 2 ; ellipse elongates horizontally
a) Find the center of the ellipse: , 2,3
b) Find the ver
x y
a a b b
a b c c c c
a x
h k
tices: , 2 5,3
c) Find the foci: , 2 13,3
h a k
h c k
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2 2
Ellipse in General Form: 4 ² 9 ² 16 -18 5 0.
Find center, vertices, and foci.
4 ² 9 ² 16 -18 5 0
4 ² 16 9 ² -18 -5
4 ² 4 9 ² - 2 -5
Half of 4 = 2; 2 4; Half of -2 = -1; -1 1
4 ² 4 4 9 ² -
x y x y
x y x y
x x y y
x x y y
x x y
2 2
2 2
2 1 -5+4 4 9 1
4 2 2 9 1 -1 20
4 2 9 1 20
4 2 9 1 1
20 20
y
x x y y
x y
x y
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2 2
2 2
2 2
2 2 2 2
2
22
Ellipse in General Form: 4 ² 9 ² 16 -18 5 0
2 1 1
20/4 20/9
2 1 1
5 20/9
5; 5; 20 / 9; 20 / 9
5 20 / 9
=25/9 25 / 9 = 5/3
Note: is under 2 ;
x y x y
x y
x y
a a b b
a b c c
c c
a x
ellipse elongates horizontally
a) Find the center of the ellipse: , 2,1
b) Find the vertices: , 2 5,1
c) Find the foci: , 2 5/3,1
h k
h a k
h c k
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Find an equation of the ellipse that has the following:
Center:(0, 0) Vertex: (0, 5) ; Focus(0,3)
Note: Ellipse is elongated vertically.
5 distance from center to vertex
3 distance fro
a
c
2 2 2 2 2
2 2
2 2
2 2
m center to focus
25 = + 9 16 4
1; Elongated Vertically
0 01; Elongated Vertically
16 25
a b c b b b
x h y ka b
b a
x ya b
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Find an equation of the ellipse that has the following:
3Vertices: (0, 10) and (0, 2); Eccentricity:
5
Note: Ellipse is elongated vertically.
Center: (0, 6); 4 = distance from center to verta
22 2 2 2 2 2
2 2
2 2
2 2
ex
3 3Eccentricity: 5 12 12 / 5
5 5 4
4 = + 12 / 5 256/25
1; Elongated Vertically
0 61; Elongated Vertically
256/25 16
c cc c
a
a b c b b
x h y ka b
b a
x ya b
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Hyperbola with Branches Opening Left and Right
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Hyperbola with Branches Opening Up and Down
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22
2 2
2 2 2 2 2
4Find center, vertices, and foci for 1.
16 25
: Hyperbola has branches opening left and right.
16; 4; 25; 5
16 25 41 41
a) Find the center of the hyp
yx
Note
a a b b
c a b c c c
erbola: , 0,4
b) Find the vertices: , 0 4,4
c) Find the foci: , 0 41,4
d) Equations of asymptotes:
5 0 4
4
h k
h a k
h c k
by x h k y x
a
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2 2
2 2
2 2 2 2 2
2 1Find center, vertices, and foci for 1
9 25
Note: Hypobola has branche opening up and down.
9; 3; 25; 5
9 25 34 34
a) Find the center of the
y x
a a b b
c a b c c c
hyperbola: , 1, 2
b) Find the vertices: , 1, 2 3
c) Find the foci: , 1, 2 34
d) Equations of Asymptotes:
3 1 -2
5
3 1 2
5
h k
h k a
h k c
ay x h k y x
b
y x
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2 2
2 2
2 2
2 2
2
Equation of hyperbola: 36 72 36 16 96 144 576
Find center, vertices, and foci.
36 72 36 16 96 144 576
36 72 16 96 576 36 144
36 2 16 6 684
Half of 2 1; -1 1; Half of
x x y y
x x y y
x x y y
x x y y
2
2 2
2 2
2 2 2 2
6 = 3; 3 9
36 2 16 6 684 36 1 -16 9
36 1 1 16 3 3 576
36 1 16 3 576
36 1 16 3 1 31 1
576 576 16 36
1 9x x y y
x x y y
x y
x y x y
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2 2
2 2
2 2
2 2 2 2 2
36 1 16 31
576 576
1 31
16 36
: Hyperbola has branches opening left and right.
16; 4; 36; 6
16 36 52 52
a) Find the center of the hyperbola: , 1,
x y
x y
Note
a a b b
c a b c c c
h k
3
b) Find the vertices: , 1 4, 3
c) Find the foci: , 1 52, 3
d) Equations of asymptotes:
6 1 -3
4
3 1 3
2
h a k
h c k
by x h k y x
a
y x
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Find an equation of the hyperbola that has the following:
Center:(0, 0) Vertex: (4, 0) ; Focus(6, 0)
Note: Hyperbola has branches opening left and right.
4 distance from center to vertexa
2 2 2 2 2
2 2
2 2
2 2
6 distance from center to focus
36 16 20
Equation of hyperbola: 1
0 0 1
16 20
c
c a b b b
x h y k
a b
x y
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Find an equation of the hyperbola that has the following:
Vertices: (0, 10) and (0, 4); Foci: (0,12), (0,2)
Note: Hyperbola has branches opening up and down.
Center: (0, 7)
3 distance from centea
2 2 2 2 2
2 2
2 2
2 2
r to vertex
5 distance from center to focus
25 9 16
Equation of hyperbola: 1
7 0 1
9 16
c
c a b b b
y k x h
a b
y x
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