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[The Discriminant of The Quadratic] (.)
.∆ b2 − 4ac
∆ = b2 − 4ac
x = −b ± ∆
2a
: ()
∆=0
. x1 = x2 = −b
2a
∆>0 ()
.x2 = −b − ∆ x1 = −b + ∆
2a 2a
. ∆ ∆<0 ()
()
.
∆ cba
. m ()
:x 2 − 2x + m = 0 ()
() ()
.
