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The center of the circle x ^ 2 + y ^ 2-4x + 2Y = 0 is () and the radius is ()
Center type: (X-2) &# 178; + (y + 1) &# 178; = 5 so: the center is (2, - 1) radius = √ 5 ~ always 523 for you, I wish you progress in your study ~ ~ ~ if you agree with my answer, please click the [adopt as satisfactory answer] button in time ~ ~ the mobile phone questioner can comment "satisfied" on the client ~ ~ ~ your adoption is my driving force ~ ~ ~ if there are any new questions, Please ask me for help. The answer is not easy. Please understand~~
If the line x-5y + 3 passes through the center of the circle X & # 178; + Y & # 178; - MX + 2Y + (M & # 178 / 4) - 1 = 0, then M =?
x²+y²-mx+2y+(m²/4)-1=0
(x-m / 2) ^ 2 + (y + 1) ^ 2 = 2
The center of the circle (M / 2, - 1) is substituted into the linear equation
M / 2-5 (- 1) + 3 = 0 leads to M = - 16
Given that the equation of a circle is (x + 1) &# 178; + (Y-3) &# 178; = 9, what is the center coordinate and radius of the circle
The center coordinate of the circle is (- 1,3), and the radius of the circle is 3
RELATED INFORMATIONS
- 1. Given that the equation of a circle is x ^ 2 + y ^ 2 + 4x-2y + 3 = 0, then the center coordinates and radius of the circle are
- 2. Let - 5 belong to the set {xix2-ax-5 = 0}, then the sum of all elements in the set {x2-4x-a = 0} is? "
- 3. If there is only one element in the set a = {x | x2 + ax + 1 = 0}, then the value of a is () A. 0b. 0 or 2C. 2D. - 2 or 2
- 4. Let a = {x │ X2 - (a + 2) x + 2A
- 5. The known set a = {x | x2-4x + 2A + 6 = 0}, B = {x | x}
- 6. Let m = {0,1}, N + {11-A, LGA, 2 ^ A, a}, whether there is a real number a, such that M intersects n = {1}
- 7. The focus of the ellipse x ^ 2 + y ^ 2 = 1 is F1, F2, and the point P is the moving point on it. When the angle f1pf2 is an obtuse angle, the abscissa of point P is ∩_ ∩)
- 8. The value range of M is obtained when the line y = x + m intersects the ellipse x ^ 2 / 16 + y ^ 2 / 9 = 1 X square / 16 + y square / 9 = 1: 9x ^ 2 + 16y ^ 2-144 = 0 Take y = x + m into the elliptic equation, and 9x ^ 2 + 16 (x + m) ^ 2-144 = 0 Sorted: 25X ^ 2 + 32mx + 16m ^ 2-144 = 0 Because there are two intersections, so Δ > = 0 That is, Δ = (32m) ^ 2-4 * 25 * (16m ^ 2-144) > = 0 Sorted out: m ^ 2-25
- 9. The focus of ellipse x ^ 2 / 9 + y ^ 2 / 4 = 1 is f1.f2, and the point P is the moving point. When the angle f1pf2 is an obtuse angle, the abscissa of point P is________ ?
- 10. It is known that the fixed point of the parabola y = ax square + BX + C is on the x-axis, and the intersection point of the parabola and the y-axis is B (0,1), and B = - 4ac. I have found that the analytical formula of the parabola is y = 1 / 4x plane It is known that the fixed point of the parabola y = ax square + BX + C is on the x-axis, and the intersection point with the y-axis is B (0,1), and B = - 4ac I have worked out the parabola analytic formula as Y = 1 / 4x square - x + 1 Points B (0,1), a (2,0) Is there C on the parabola? A circle with diameter BC passes through vertex a? C coordinate and center P are requested! (3) On the basis of (2), the relationship between abscissa and ordinate of B, P and C is analyzed
- 11. It is proved that no matter what the value of K is, there are two intersections between the line L: kx-y-4k + 2y-3 = 0 and the circle C: X & # 178; + Y & # 178; - 6x-8y + 21 = 0 It is proved that no matter what the value of K is, there are two intersections between the line L: kx-y-4k + 2y-3 = 0 and the circle C: X & # 178; + Y & # 178; - 6x-8y + 21 = 0
- 12. For the function y = 2x, when it is less than or equal to 2, the value range of Y is y____ 1 or Y_____ .
- 13. The function y = - 2x ^ 2-4x + 3 is known. When the independent variable x is in the following value range, calculate the maximum or minimum value of the function respectively, and calculate the value of the function And find the value of the corresponding independent variable x when the function takes the maximum or minimum value
- 14. x²+4x+3
- 15. What is the solution of X & # 178; - 13X + 12 = - 4x & # 178; + 18?
- 16. As shown in the figure, it is known that the image of quadratic function y = x2 + BX + C passes through points (- 1,0), (1, - 2). When y increases with the increase of X, the value range of X is___ ．
- 17. It is known that the image of quadratic function y = x + bx-3 passes through the point (- 2,5)
- 18. As shown in the figure, it is known that the image of quadratic function y = x2 + BX + C passes through points (- 1,0), (1, - 2). When y increases with the increase of X, the value range of X is___ ．
- 19. How to fill in the brackets of X & # 178; + 1 / X & # 178; = (x + 1 / x) & # 178; - () = (x-1 / x) & # 178; + ()?
- 20. Remove the brackets from (x-4) - (- y + 2Z)______ [urgent]