The general form of a quadratic equation is ax^{2}+ bx+ c=y, where a = 0 and a,b,c are the parameters which influence its U-shaped parabola graph. This is an example of a non-linear function with its highest exponent 2.

A quadratic function is a polynomial function with a second degree which means that the highest degree (or exponent) in a quadratic functions can only be ’2’. The graph of a quadratic function is a U-shaped parabola and it depends on parameters like a,b,c as shown below!.

**Example: **f(x) = x^{2 }– 5x -6 find the vertex and axis of symmetry.

** Non linear functions: **Non-linear functions are of the form **other than** f(x) = ax + by + c. The graphs of non-linear functions are of different shapes.

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