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“Discr
imin
atin
g Di
scrim
inan
t”
Solving
xx
gives
ab
c
xb
bac
a
25
20
25
24
25
542
222
525
164
59
4
2 2 2
−−
==
=−
=−
=−
±−
=±
−−
××−
×
=±
−+
=±
−
,,
()