The focus coordinate of the parabola y = - x is
The square of y = - x can be changed to: x ^ 2 = - y, at this time 2p = 1, P = 1 / 2, so: the focus coordinate is (0, - 1 / 4)
RELATED INFORMATIONS
- 1. If the square of the parabola y is equal to 2px (P is greater than 0), the distance between the big focus of the point with abscissa 2 is 3, then the value of P is 0
- 2. If the square of the parabola y equals 2px (P > 0), the distance from a point m to the focus is a (a > P / 2), then the abscissa of point m is? I'd like to know why the coordinates of point m are half a,
- 3. If the distance from point a to the focus on the parabola y ^ 2 = 2px is 3 and the abscissa of the point is 2, what is p equal to
- 4. First, determine the opening direction, symmetry axis and vertex coordinates of the parabola y equal to the square of 1 / 2 x plus x minus 4, and draw the drawing at the tracing point
- 5. Let the parabolic equation be x = 2Y ^ 2, and the distance from the focus to the collimator is equal to?
- 6. The distance from the focus of the parabola y2 = 10x to the collimator is () A. 52B. 5C. 152D. 10
- 7. What is the distance between the focus of the parabola y = - 12x and the directrix?
- 8. It is known that the square of the line passing through the parabola y is equal to the focus F of 4x, and intersects with the parabola at two points a and B The first question is to find the area of the triangle ABO when the oblique line is 1. The second question is to find the trajectory equation of the midpoint m of the focus chord ab
- 9. The equation of a circle with F as the center and ab as the diameter is______ .
- 10. The Quasilinear equation of parabola y2 = 4x is () A. x=1B. y=1C. x=-1D. y=-1
- 11. What is the focus coordinate of the square of the emergency parabola y = x
- 12. The square of the parabola y = - x, the focal coordinate is? I don't have any more,
- 13. The focal coordinates of the parabola y2 = 8x are______ .
- 14. Four times bracket 9.3 minus 5.7 brackets plus 3.6.0.67 times 99 plus 0.67.4.25 divided by 2.5 times 101 minus 1.7.6.8 plus 1.25 times 6.8 times 8. Please help me use the simple method of off formula calculation, and write down the process
- 15. (1988+1986+1984+… +6+4+2)-(1+3+5+… +1983+1985+1987)
- 16. What is the least common multiple of 63, 27 and 36
- 17. What is 364.3 and 15.4?
- 18. One in seven times three times two in seventeen If you can calculate simply, you can calculate simply
- 19. 0.375=9( )=______ ÷16=______ :8=______ %
- 20. 76 * (1 / 23-1 / 53) + 23 * (1 / 53 + 1 / 76) + 53 * (1 / 23-1 / 76), please explain the reason, thank you!