Enter the slope and the coefficient of “a” into the Calculator. The calculator will evaluate the Axis of Symmetry Equation. 

Axis of Symmetry Equation Formula

x = -b/2a


  • x is the Axis of Symmetry Equation ()
  • b is the slope
  • a is the coefficient of a

To calculate Axis of Symmetry Equation, divide the negative value of the slope by 2 times the coefficient of a.

How to Calculate Axis of Symmetry Equation?

The following steps outline how to calculate the Axis of Symmetry Equation.

  1. First, determine the slope. 
  2. Next, determine the coefficient of a. 
  3. Next, gather the formula from above = x = -b/2a.
  4. Finally, calculate the Axis of Symmetry Equation.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

slope = 3

coefficient of a = 6