If `x+y=15`, show that `x^(2)+y^(2)` is least , when `x=y=(15)/(2)`.

If x>0,y>0,x+y=15 and x^(3)y^(2) is maximum then x=..., y=...

x^(2)+y^(2)+2y=15 then dy/dx=

The value of 9x^(2) + 49y^(2) - 42 xy , when x = 15 and y = 3 is

Show that the circle x^(2)+y^(2)-2y-15=0 lies completely within the circle x^(2)+y^(2)-x-30=0

y=(x^(3))/(x^(2)+15) increases in

Show that the system of equations " " 6x + 5y = 11, 9x + ( 15) /(2) y = 21 . has no solution

Find the real numbers (x,y) that satisfy the equation: xy^(2) = 15x^(2) +17xy + 15y^(2) x^(2)y = 20x^(2) + 3y^(2)

If 3x+5y=15 and x-2y=10 , what is the value of 2x+7y ?

If 1.5 x = 0.04 y , then the value of (y^(2) - x^(2))/(y^(2) + 2xy + x^(2)) is