It is known that there is a transfer function in the second

order between a process output $($y$)$ and input $($x$).$ As a result

of the increase of $1\mathrm{.}5$ step units in the input, it has been

determined that the change of the output with time is realized

according to the following equation.

$()=9$

$0\mathrm{.}25+7$

$0\mathrm{.}3+3$

Accordingly, apply the Smith method to form the transfer

function between the output and input.