The indicated function

y$1($x$)$

is a solution of the following differential equation.

y$4$y$+4$y $=0$; y$1=$ e$2$x

Use reduction of order, or the formula

y$2=$ y$1($x$)$

e$$P$($x$)$ dx

y

$2$

$1$

$($x$)$

$$dx

as instructed, to find a second solution

y$2($x$).$

y$2=$