Answer
$x = \dfrac{5}{2}$ or $x=-\dfrac{5}{2}$
Work Step by Step
When taking a square root of a number,
there is always a positive root and a negative root.
Divide $4$ to both sides:
$x^2 = \dfrac{25}{4}$
Take the square root of both sides:
$x = \pm \sqrt{\frac{25}{4}}$
The square roots of 25 are $5$ and $-5$,
the square roots of 4 are $2$ and $-2$,
Therefore
$x = \pm \dfrac{5}{2}$
