Most of the function finale problems in junior high school mathematics are quadratic functions, so those formulas and laws about quadratic functions must be mastered. 1. quadratic function y = ax 2, Y = A (X-H) 2, Y = A (X-H) 2+K, y = ax 2+bx+c (among all kinds, a≠0) has the same image shape, but different positions. k)x = 0 y=a(x-h)^2(h,0)x = h y=a(x-h)^2+k(h，k)x = h y=ax^2+bx+c(-b/2a,(4ac-b^2)； /4a)x=-b/2a when h >; 0, the parabola y = ax 2 is moved to the right by h units in parallel, and the image of y = a (x-h) 2 can be obtained, when h 0, k>0) is h >; 0, k<0, moving the parabola y = ax 2 to the right by h units in parallel, and then moving it down by | k units, you can get the image when y = a (x-h) 2+k (h > 0, k & lt0)h; 0, the image falls above the X axis, and when X is an arbitrary real number, there is y >；; 0; When a<0, the image falls below the X axis, and when X is an arbitrary real number, there is Y.

According to the requirements of the topic, a series of knowledge about Pythagoras' law may appear in this kind of topic. So I suggest you do more classic examples. Hope to adopt.