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Let
x
x
x
be a solution to
a
x
2
+
b
x
+
c
=
0
ax^2+bx+c=0
a
x
2
+
b
x
+
c
=
0
. Then
x
=
−
b
±
b
2
−
4
a
c
2
a
.
x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}.
x
=
2
a
−
b
±
b
2
−
4
a
c
.