Which of the following functions represent as implicit function, where f(x) and 'Y' are dependent variables and x denotes independent variable?

f(x) = 3x^2 + 4x + 1

f(x) = x^3 + 2x^2 + 6x

f(x) = x^3 + x^2y + 4y^2

None of these

Implicit functions involve both dependent (y) and independent (x) variables in the same equation without explicitly solving for y.

Explicit functions directly express y in terms of x (e.g., f(x) = 3x² + 4x + 1).