" 4.If "y=f(x)" and "y^(4)-4y+x=0" .If "f(-8)=2" then the value of "128f'(-8)|" is "

If y = f(x) and y^(4) - 4y + x = 0 . If f (-8) = 2 , then the value of |28 f' (- 8)| is

If y = f(x) and y^(4) - 4y + x = 0 . If f (-8) = 2 , then the value of |28 f' (- 8)| is

If f(x + y) = f(x) +f(y), then the value of f(0)

If for all values of x and y , f(x+y) =f(x) f(y) and f(5) =2, f'(0)=3, then the value of f'(5) is-

Let X be the set of all positive integers greater than or equal to 8 and let f:X rarr X be a function such that f(x+y)=f(xy) for a>=4,y>=4, If f(8)=8, then the value of f(20) is

If f(2(x)/(y))=f(2x)-f(y) for all x,y>0 and f(3)=2, then the value of [f(7)], is

For all real x and y, f(x + y) = f(x)f(y), if f(4) = 4 and f'(0) = 3 then find the value of f'(4).

Let f(x) be continuous and differentiable function everywhere satisfying f(x+y)=f(x)+2y^(2)+kxy and f(1)=2, f(2)=8 then the value of f(3) equals

If 2f(x+y)=f(x).f(y) for all real x, y. where f'(0)=3 and f(4)=25 , then the value of f'(4) is equal to

If f(2x + 3y, 2x-3y)=4xy , then find the value of f(x,y)