To find the axis of symmetry, which mathematical operation is primarily used?

The axis of symmetry for a quadratic function, which commonly takes the form (y = ax^2 + bx + c), can be found using a specific formula derived from the coefficients of the function. The formula to find the axis of symmetry is (x = -\frac{b}{2a}).

In this formula, the operation of subtraction is used within the expression (-b), which is the first step in determining the x-coordinate of the vertex for this quadratic function. After calculating (-b), division by (2a) is performed to find the final result. While division is essential in the overall computation, the key initial operation that sets the process in motion is the subtraction of the coefficient (b) from zero.

Thus, recognizing that the process begins with subtraction clarifies why this answer is relevant when identifying the axis of symmetry.