Axis of Symmetry Formula
The axis of symmetry formula helps in calculating the axis of symmetry for any given graph. A line that divides or bifurcates any object into two equal half’s, both halves of which are mirror images of each other is called the axis of symmetry. This line of axis dividing the objects could be any one of the three types that are: horizontal (xaxis), vertical (yaxis), or inclined axis. Let us understand the axis of symmetry formula in detail in the following sections.
What Is Axis of Symmetry Formula?
Axis of symmetry is mainly of two types: Bilateral symmetry  Symmetry in which the left and right sides of the objects can be divided into approximate mirror images of each other along the midline. Radial symmetry  Symmetry in which the sides exhibit correspondence or regularity of parts around a central axis. Axis of symmetry formula can be expressed as,
x = b/2a
Let us have a look at a few solved examples to understand the axis of symmetry formula better.

Example 1: Using the axis of symmetry formula, find the axis of symmetry of the quadratic equation y = x^{2}  4x + 3.
Solution:
To find : Axis of symmetry of the equation y = x^{2}  4x + 3
Given: y = x^{2}  4x + 3Using axis of symmetry formula,
x = b/2a
x = (4)/2(1)
x = 4/2
= 2
Answer: Axis of symmetry of equation y = x^{2}  4x + 3 is x = 2.

Example 2: Find the axis of symmetry of a parabola y = 4x^{2}.
Solution:
To find: Axis of symmetry of parabola y = 4x^{2} + 0x + 0.
Using axis of symmetry formula,
x = b/2a
x = (0)/2(1)
= 0
Answer: Axis of symmetry of equation y = 4x^{2} is x = 0.