[header] How to find an axis of symmetry [title] Check the degree of your polynomial. [step] 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. [substeps] To illustrate, take, as an example, the polynomial 2x 2 + 3x-1.