# Quadratic formula

```latex
\begin{aligned}
ax^2+bx+c &= 0\\
x^2+\frac{b}{a}x &= -\frac{c}{a}\\
\left(x+\frac{b}{2a}\right)^2 &= \frac{b^2-4ac}{4a^2}\\
x &= \frac{-b\pm\sqrt{b^2-4ac}}{2a}.
\end{aligned}
```