1. ( 8, 15/2)
2. (-8, 15/2)
3. (8, -15/2)
4. (-8, -15/2)
(8, -15/2)
1. x2 + y2 - 6x + 12y +15 = 0
2. x2 + y2 - 6x + 12y - 30 = 0
3. x2 + y2 - 6x + 12y - 25 = 0
4. x2 + y2 - 6x + 12y - 20 = 0
x<sup>2</sup> + y<sup>2</sup> - 6x + 12y +15 = 0
1. x2 + y2 + x + 3y + 3 = 0
2. 2x2 +2y2 + 2x + 6y + 1 = 0
3. x2 + y2 +x +6y + 1 = 0
4. 2x2 + 2y2 + x + 3y +1 = 0
2x<sup>2</sup> +2y<sup>2</sup> + 2x + 6y + 1 = 0
1. 12
2. 16
3. 24
4. 25
16
1. ( 4√ 3, 8 )
2. ( 8, 4√ 3 )
3. ( 9, 4√ 3 )
4. ( 4√ 3, 9 )
( 9, 4√ 3 )
1. 4x2 + 5xy - 6y2 - 11x + 11y + 50 = 0
2. 4x2 + 5xy - 6y2 - 11x + 11y - 43 = 0
3. 4x2 - 5xy - 6y2 - 11x + 11y + 57 = 0
4. x2 - 5xy - y2 - 11 x + 11y - 43 = 0
4x<sup>2</sup> - 5xy - 6y<sup>2</sup> - 11x + 11y + 57 = 0
1. a2b2 / ( a2 - b2 )
2. a2b2 / ( a2 + b2 )
3. ( a2 + b2 ) / a2b2
4. ( a2 - b2 ) / a2b2
a<sup>2</sup>b<sup>2</sup> / ( a<sup>2</sup> + b<sup>2</sup> )
1. 10
2. 7/2
3. -12
4. -2
-12
1. (1, 1, 4)
2. (1, 0, 5)
3. (2, 3, 5)
4. (0, 6, -1)
(1, 0, 5)
1. a < b < c
2. b < a < c
3. b < c < a
4. c < a < b
b < a < c