a
x
2
+
b
x
+
c
=
0
ax^2 + bx + c = 0
Δ
=
b
2
-
4
a
c
\Delta = b^2 - 4ac
x
=
-
b
2
a
x = -\frac{b}{2a}
x
=
-
b
±
Δ
2
a
x = \frac{-b \pm \sqrt{\Delta}}{2a}
x
=
-
b
±
i
-
Δ
2
a
x = \frac{-b \pm i \sqrt{-\Delta}}{2a}