This week in precalculus 11 I learned about discriminant. It was an easy lesson. The expression , is called discriminant of the quadratic equation because it discriminates among the types of possible solution. Here is an example:

calculate the value of the discriminant of this quadratic equation.

first step: write down the equation first

second step: write down what is a, b and c

a= 2 b=-8 c= 4

third step: put everything in the equation

64+32=96

this equation has two real roots so 97> 0