If `f(x) = x^2-4` then the value of `f(4)` is

If f(x)=x^3+2x then find the value of f(4)

A real valued function f:R rarr R satisfies f(x)+f(5x+y)+6xy=f(9x-y)+18x^(2)+4 Then the value of f(4) is equal to

If f(x)=2x^(2)+6x-1 , then the value of (f((3)/(4))+1)/(f((3)/(4))-1) is

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(x) (2^(x+2)-16)/(4^(x)-2^(4)), x != 2 is continuous at x = 2 , then the value of f(2) is

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

A function is defined as f(x)=x^(2)-3x. Find the value of f(2). Find the value of x for which f(x)=4

Suppose f is a real function satisfying f(x+f(x))=4f(x) and f(1)=4. Then the value of f(21) is 162164105