How to judge whether a, B and C in quadratic function image are greater than or less than or equal to 0

Whether the opening is up or down, we can see a > 0 or a

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1. How to judge whether a, B and C are positive or negative or equal to 0 according to the image of quadratic function What's more, for example, how can you judge 4A + 3B + C according to the image
2. How to judge whether a + B + C.A + B-C 2a-c 2a-b is greater than zero if a graph of quadratic function is given
3. As shown in the figure, the image of quadratic function passes through the point a (- 1,0) B (4,0) C (0, - 2) to find the analytic expression of quadratic function, and judge whether the triangle ABC is true or not
4. In the selection of quadratic function, the question only gives the right or wrong of the conclusion. Do you need to find the quadratic function expression and ABC according to the image? Is there any other way to find it? What if the image of a quadratic function of a question is on the X and Y axes, but there are no coordinate points?
5. How to draw an elliptic equation with the Geometer's Sketchpad, it says to create one or more functions first,
6. P is a point in the quadrilateral ABCD, connecting PA, Pb, PC, PD and AC, proving s triangle APC = triangle apb-s triangle APD Parallelogram ABCD
7. Given that the image of quadratic function passes through the point (- 1,0) (5,0), the maximum value of the function is 6, find the analytic expression of the function
8. 48 pieces are arranged in a regular hexagon. The number of pieces on each side is equal. How many pieces are placed on each side?
9. As shown in the figure, all quadrangles are squares, and all triangles are right triangles, Please find several figures in the figure so that the sum of their areas is exactly equal to the largest square area. Try to give more than two schemes
10. If you extend the top and bottom of a right angled trapezoid by 5cm, the area will increase by 25cm, and then it will become a square. Find the area of the original right angled trapezoid
11. The image of quadratic function is known to pass through points a (1 / 2,3 / 4), B (- 1,3), C (2,3), and its analytical formula is______ ?
12. A quadratic function image through a (- 1.0) B (0.5) C (4.5) (1) find the analytic expression of quadratic function (2) find the quadratic function A quadratic function image passes a (- 1.0) B (0.5) C (4.5) (1) Finding the analytic expression of quadratic function (2) Finding the axis of symmetry and vertex coordinates of quadratic function (3) According to the image to answer what value x takes when x ≥ 0 (the image is three coordinates)
13. We know that the image of quadratic function passes through three points a (1,3) B (- 1,5) C (2, - 1) I can't do my homework... Help me...
14. The image of quadratic function passes through three points a (1 / 2,3 / 4), B (- 1,3), C (2,3),
15. Given that f (x) is a quadratic function and the image passes through a (2. - 3), B (- 2. - 7) and C (0. - 3), what is the analytic expression of F (x)
16. The image of a given quadratic function f (x) passes through a (- 1,0) B (3,0) C (1, - 8) (1) find the analytic expression of F (x) (2) find the solution set of inequality f (x) ≥ 0
17. Given the image of quadratic function f (x) over a (- 1,0), B (3,0), C (1, - 8) To find the analytical formula, I calculate that f (x) = 2x ^ 2-4x-6. It's wrong to simplify x ^ 2-2x-3. What's the matter
18. Given the image over total a (- 1,0), B (3,0), C (1,8) of quadratic function f (x)
19. For example, if the graph is a graph of quadratic function, the equation AX2 + BX + C = 3 of X follows? The graph is the axis of symmetry, and the ordinates are 3, A0, C > 0
20. I want the detailed knowledge of quadratic function, and then add exercises with answers (otherwise I don't know right or wrong)~