Thomas Calculus 13th [Solutions]

Section 11.6 Conic Sections 839
9.
2
2
y
y 12x x 4 p 12 p 3;
12
focus is (3, 0), directrix is x 3
10.
2
2
x 6y y x 4 p 6 p 3 ;
6 2
focus is 0, 3 , directrix is y 3
2
2
11.
2
2
x 8y y x 4 p 8 p 2;
8
focus is (0, 2), directrix is y 2
12.
2
2 y
y 2x x 4 p 2 p 1 ;
2 2
focus is 1
2 ,0 , directrix is x 1
2
13.
2
2
y 4x y x 4 p 1 p 1 ;
4 16
1
4
focus is 0, 1 , directrix is y 1
16
16
14.
2
2
y 8x y x 4 p 1 p 1 ;
8 32
focus is 0, 1 , directrix is y 1
32
32
1
8
15.
2
2 y
x 3y x 4 p 1 p 1 ;
3 12
1
3
16.
2
2 y
x 2y x 4 p 1 p 1 ;
2 8
1
2
focus is 1
12 , 0 , directrix is x 1
12
focus is 1
8 , 0 , directrix is x 1
8
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