1.

Let (f(x+y)-f(x))/2 = (f(y)-a)/2+xy for all real x and y . If f(x) is differentiable and f'(0) exists for all real permissible values of a and is equal to sqrt(5a-1-a^2) then f(x) is

Answer»

POSITIVE for all real X
negative for all real x
f(x) = 0 has real ROOTS
cannot say ANYTHING about the sign of f(x)

Answer :A


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