Answer
$\pm x$
Work Step by Step
Twice the square root of the last term (which is $
\dfrac{1}{4}
$) of the given trinomial is $
1
.$ Therefore, the two possible missing terms that will make the given trinomial a perfect square is
\begin{array}{l}\require{cancel}
\pm1x
\\\\=
\pm x
.\end{array}