Maeckes logo

<    1      2    >


Quadratic formula

With the quadratic formula you can factorize a quadratic function to obtain the roots

 


Explanation

We start with the general form

and separate a with brackets

For the square we are going to prepare a binomial formula

and write this as

The term with an x is handled separately

Here you can calculate two solutions

The quadratic formula is normally written as

 


Example 1

This yields x2 + 2x – 15 = (x – 3)(x + 5) and we could have found that by trial and error.

 


Deutsch   Español   Français   Nederlands