# Senior One # Introduction Youth is a long journey and you can't go back. Youth is an unforgettable encounter. But youth left us the most precious friendship. Friendship is actually very simple, as long as a short greeting, a gentle understanding, a faint memory is enough. When we say goodbye in tears during graduation season, please don't let goodbye never happen again. This article "Required Mathematics Knowledge Points for Senior One: Quadratic Function" was compiled by Senior One Channel for you. I hope you like it!

I. Definition and definition of expressions

Generally speaking, there is the following relationship between independent variable x and dependent variable y:

y=ax^2+bx+c

(a, b, c are constants, a≠0, a determines the opening direction of the function, a >；; 0, the opening direction is upward, a0. Move the parabola y = ax 2 to the right by H units in parallel, and you can get the image of y = a (x-h) 2.

When h0, k>0, move the parabola y = ax 2 to the right by H units in parallel, and then move it up by K units, you can get the image of y = a (x-h) 2+k;

When h>0, k