Quadratic Formula

 

General way to write a quadratic equation is:

ax2 + bx + c = 0

Here a, b and c are numbers that vary for different equations.

So if the equation was:

2x2 + 7x + 11 = 0

Then a = 2, b = 7, c = 11.

 

The formula for the solution is:

This formula will work for all equations that can be solved.

 

Example:

Solve 2x2 - 5x - 6 = 0

Here a = 2, b = -5, c = -6

Substituting these values in the formula, gives you: