Solved exercise - Quadratic equation

Quadratic equation of the form:

x represents unknown, and a, b, and c represent known numbers such that a is not equal to 0. If a = 0, then the equation is linear, not quadratic

Quadratic equation has two roots (solutions):

Example:

Given the Quadratic equation 

 In this equation a = 1 , b= 9, c = 18

 The roots are: 

Check:

Check for - x1 = -3


Check - x2 = -6