Question

solve for z.
$z^{2}=4$
$z = square$ or $square$

Explanation:

Step1: Take square - root of both sides

$z=\pm\sqrt{4}$

Step2: Calculate the square - root value

Since $\sqrt{4} = 2$, then $z = 2$ or $z=-2$

Answer:

$z = 2$ or $z=-2$