Condition
Quadratic Equation to have real roots if discriminant is
- positive (d＞0)
- Equal to Zero(d=0)
Because, Formula of Quadratic Equation for finding the roots is
x1=(-b + ✓d)/2a
x2=(-b - ✓d)/2a
For Example -1 we put value of d=16
x1=(-b + ✓16)/2a
x1=(-b + 4)/2a (Root is real)
For Example -2 we put value of d=0
x2=(-b + ✓0)/2a
x2=(-b + 0)/2a
x2=(-b)/2a (Root is real)
