How to write image 2 of quadratic function

There are three ways to find the expression of quadratic function image: 1) the general formula ax ^ + BX + C = y. to determine the coefficients a, B, C, three known coordinate points can be found on the image, and then a cubic equation can be obtained by substituting them into each other. 2) the analytic formula a (x + x1) (x + x2) = yx1, X2 is the intersection coordinates of quadratic function on X axis

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1. Write an analytic expression of quadratic function, so that its image satisfies two conditions The vertex is on the line y equals - X Without going through the origin, the analytic expression of this quadratic function can be?
2. How to understand quadratic function?
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4. Quadratic function. 1. The quadratic function y = AX2 + BX + C passes through (1, - 1) (2,1) (- 1,1) to find the analytic expression of the quadratic function 2. The vertex of the parabola y = X2 - (a + 2) x + 9 is on the x-axis 3. Given that the image of quadratic function intersects with X axis at two points a (- 2,0) B (3, O), and the maximum value of the function is 2, find the analytic expression of quadratic function
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6. What is a quadratic function and how can I understand it?
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