The maximum possible value of `x^(2)+y^(2)-4x-6y, x, y in RR` subject to the condition `|x+y|+|x-y|=4`

If m is the minimum value of f(x,y)=x^(2)-4x+y^(2)+6y when x and y are subjected to the restrictions 0<=x<=1 and 0<=y<=1, then the value of |m| is

If m is the minimum value of f(x,y)=x^(2)-4x+y^(2)+6y when x and y are subjected to the restrictions 0lexle1and0leyle1 , then the value of |m| is ____________

The minimum value of 2x + 3y subject to the condition x+4y ge 8, 4x+y ge 12, x ge 0 and y ge 0 is

The maximum value of Z = 4x + 2y subject to the constraints 2x+3y le 18,x+y ge 10, x , y ge 0 is

The maximum value of Z = 3x + 4y subject to the constraints: x + y le 4, x ge 0, y ge 0 is :

If x ^(2) + y^(2) - 14 x - 6y - 6=0, then the maximum possible value of 3x + 4y is (where (x,y) is a point on the given curve)