The main process of applying the method of undetermined coefficient to solve elliptic standard equation is?

The undetermined coefficient method is to first set the basic form of the equation, and then bring in the coordinates of the points through which the curve passes
In general, one coordinate for an unknown number, two coordinates for two unknowns, and so on

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1. The general steps of finding the analytic expression of function by undetermined coefficient method Be specific
2. The equation of the circle passing through the point a (0,5) B (1, - 2) C (- 3, - 4) is solved by the method of undetermined coefficient, and D E F is calculated first
3. 1) Try to find the circular equation through three known points （1,1）（2,-1）（3,2） 2) A circle and two parallel lines 2x + y = 5 are tangent to 2x + y + 15 = 0 and pass through point (2,1) Find the equation for this circle 3) A circle passes through (1,1) and (1, - 1) and is tangent to the straight line X - 2 = 0. Find the equation of the circle 4) Try to find the parameter equation of circle x ^ 2 + y ^ 2-x-3y = 0 5) Try to find the circular equation with the diameter of the line between (2, - 5) and (8, - 1), and find the parametric equation of this circle 20 points for answering one question
4. What is the equation for a circle?
5. Seeking: the equation of circle High school students, know the equation of the circle, please write down in the walk! Must want this formula, thank you ha!
6. The equation for finding a circle An equation for finding a circle with diameter a (- 4,0) B (0,2)
7. Equation of circle (on line, etc.) In XY coordinates, the radius r of the circle point at C (0,10) is 190, and there is a point B at the intersection of the circle point and the positive half axis of the X axis. When the point B moves on the X axis, the trajectory of the origin C is relatively fast~ In XY coordinates, the radius r of the circle point at C (0, a) is 190, and there is a point B at the intersection of the circle point and the positive half axis of the X axis. When the point B moves on the X axis, the trajectory of the origin C is the same. It's urgent~
8. What is the undetermined coefficient method Ditto (detailed)
9. Given that the equation of circle O is x ^ 2 + y ^ 2 = 9, find the locus of the middle point P of the circle passing through the chord of point a (1,2)? Given that the equation of circle O is x ^ 2 + y ^ 2 = 9, find the locus of the midpoint P of the chord of the circle passing through point a (1,2)? Thank you
10. It is known that the radius of the center (0,2) of the circle m is 1, q is the moving point on the x-axis, QA and QB are tangent to the circle m, a and B respectively Finding the trajectory equation of the midpoint P of the moving string ab It's on the Internet, but I can't understand it, Well, 50 more points!
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12. How to find the equation of a circle symmetric to a line?
13. The equation of line and circle If the line 3x + 4Y + k = 0 is tangent to the circle (x-3) ^ 2 + y ^ 2 = 4, then the value of K is equal to
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16. How to express a section of the circle equation For example, x ^ 2 + y ^ 2 = 1, I want to represent the trajectory of a curve in this circle, so the equation of this trajectory is also x ^ 2 + y ^ 2 = 1, but there is a value range, so how to represent this value range?
17. In the following equations, what is the equation for a circle? Multiple choice: A. x ^ 2 + y ^ 2 + 2XY + 2x + 2Y + 1 = 0 B. 2x^2+3Y^2=5 C. 4x^2+(2Y-1)^2+4X-1=0 D.(3X-1)^2+9Y^2+12Y+5=0 Please write the details and reasons, thank you
18. How to express the equation of a circle in space? Know the center coordinate, normal vector and radius length of the circle. How to express the equation of the circle? It's the equation of a circle in three-dimensional coordinates~
19. How to express the equation of circle in plane rectangular coordinate system?
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