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@ @YS@ @pý†bɾa@ @
∆ = b2 − 4ac = (−2)2 − 4 ×1 × m = 4 − 4m
.∆ = 0 ()
.m = 1 . 4 − 4m = 0
.∆ > 0 ()
( ) . 4 − 4m > 0
.m < 1
.∆ < 0 ()
.m > 1 . 4 − 4m < 0
[Sum And Products of The Roots] (.)
.ax2 + bx + c = 0 βα
ax2 + bx + c = a(x − α)(x − β)
= a(x 2 − (α + β)x + αβ)
a≠0
x 2 + b x + c = x 2 − (α + β)x + αβ
aa
α + β = −b
a
. αβ = c
a