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
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