Определите коэффициенты квадратного уравнения \(\displaystyle \frac{4}{9}x^2-25=0 {\small.}\)

\(\displaystyle a=\)[ ]\(\displaystyle {\small;}\)    \(\displaystyle b=\)[ ]\(\displaystyle {\small;}\)    \(\displaystyle c=\)[ ]\(\displaystyle {\small.}\)