The maximum value of `10x - 5x^2- 1` is

The maximum value of 10 x - 5x^2-1 is

For the real values of x, the maximum value of 7+10x-5x^(2) is

The maximum value of x/(1+x^2) is

IF A,B,C are the maximum value of 2x +5 -x^2 ,x -1 -2x^2 , 5x + 2 - 3x^2 then the descending order of A,B,C is