For quadratic equation $ax^2+bx+c=0$, where $a$, $b$ and $c$ are real numbers.
We can find the roots by
\begin{equation*}
x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}
\end{equation*}
Resources for HKDSE Mathematics
Resources for HKDSE Mathematics
For quadratic equation $ax^2+bx+c=0$, where $a$, $b$ and $c$ are real numbers.
We can find the roots by
\begin{equation*}
x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}
\end{equation*}
