Aljabar Bentuk 1

\begin{equation*}
\begin{split}
\frac{16}{25} - 4f^2& = \left(\frac {4}{5}\right)^2 - (2f)^2\\\\
\frac{16}{25} - 4f^2& = (\frac{4}{5} + 2f)(\frac{4}{5} - 2f)
\end{split}
\end{equation*}