Find the general solution to the homogeneous differential equationd$2$ydx$219$dydx$+84$y$=0$

The solution has the formy$=$C$1$f$1($x$)+$C$2$f$2($x$)$with$$f$1($x$)=$and$$f$2($x$)=$

Left to your own devices, you will probably write down the correct answers, but in case you want to quibble, enter your answers so that$$f$1,$f$2$are normalized with their value at$$x$=0$equal to $1.$