What most naturally follows?

How to find an axis of symmetry 
Check the degree of your polynomial. 
The degree (or " order ") of a polynomial is simply the largest exponent value in the expression. If the degree of your polynomial is 2 (there is no exponent larger than x), you can find the axis of symmetry using this method.
If the degree of the polynomial is higher than 2, use method 2. To illustrate, take, as an example, the polynomial 2x 2 + 3x-1.