Question

the surface area of a game cube is 384 square millimeters. how long is each edge of the cube?

Answer 1

$6a^2=384\\ a^2=64\\ a=8 \ mm$

Answer 2

$a\ \rightarrow\ the\ long\ of\ each\ edge\ of\ the\ cube\\the\ surface\ area\ of\ a\ game\ cube=384\ mm^2\\\\6a^2=384\ /:6\\\\a^2=64\ \ \ \Rightarrow\ \ \ a=8\\\\Ans.\ the\ long\ of\ each\ edge\ of\ the\ cube\ is\ 8\ mm.$