B=2a can be obtained from f(x-4)=f(2-x).
So f (x) = ax 2+2ax+c
The minimum value of f(x) on r is 0, that is, (4ac-4a 2)/4a = 0.
Get a=c and a >；; 0
So f (x) = ax 2+2ax+a.
Work plan for June 1
The beautiful and colorful April passed in such a hurry. At the beginning of the month, we were still nervously collecting information and p