The focus of a parabola is (1, 0), and a point on the parabola is (4, 4). The equation of the parabola is: A. y^2 = 4x B. y^2 = 16x C. x^2 = 4y D. x^2 = 16y 相关知识点: 试题来源: 解析 B。解析:根据抛物线的定义和焦点坐标,可得到抛物线方程的形式,再将点代入验...
The vertex of a parabola in this form is (h,k). Positive h values shift the parabola to the right, and negative h values shift the parabola to the left. Positive k values shift the parabola up, and negative k values shift the parabola down. The focus is ...
Graph and find the vertex, focus, and directrix of {eq}\displaystyle x^2 + 24 y - 8 x + 16 = 0 {/eq}.Parabolas:A parabola is a conic section in which the points are equally distant from a focus point and a directrix line. The standard form for a paraboli...
A parabola is a locus of points equidistant from both 1) a single point, called the focus of the parabola, and 2) a line, called the directrix of the parabola. What is the Focus and Directrix? The red point in the pictures below is the focus of the parabola and the red line is ...
A parabola is the locus of a point that is equidistant from a fixed line called the directrix, and a fixed point called the focus of the parabola. The standard form of the equation of a parabola is {eq}(x-h)^2=4a(y-k) {/eq}, where the focus is {eq}(h,k+...
(1) The focus of a curve of degree 2—an ellipse, a hyperbola, or a parabola—is a pointFlying in the plane of the curve and possessing the property that the ratio of the distance between any point on the curve andFto the distance to the directrix is a constant equal to the eccentri...
Step 3:Find the focus and directrix of the parabola using the equations. Equations and Definitions for Finding the Focus & Directrix of a Parabola Parabola:A parabola is a curved shape where any point is at an equal distance from a fixed point, and a fixed straight line. The fixed point ...
1.To cause (light rays, for example) to converge on or toward a central point; concentrate. 2. a.To render (an object or image) in clear outline or sharp detail by adjustment of one's vision or an optical device; bring into focus. ...
1.To cause (light rays, for example) to converge on or toward a central point; concentrate. 2. a.To render (an object or image) in clear outline or sharp detail by adjustment of one's vision or an optical device; bring into focus. ...
The ellipse and hyperbola have each two foci, and two corresponding directrixes, and the parabola has one focus and one directrix. In the ellipse the sum of the two lines from any point of the curve to the two foci is constant; that is: AG+GB=AH+HB; and in the hyperbola the ...