Question

3x^2-192=0
$3 {x}^{2} - 192 = 0$

Answer 1

$3x^2-192=0$
$3x^2=192$
$x^2=\frac{192}{3}$
$x=\pm \sqrt{64}$
$x=\pm 8$

x=-8 and x=8 are the solutions

Answer 2

$3 {x}^{2} - 192 = 0 \\ 3 {x}^{2} = 192 \\ {x}^{2} = 64 \\ \\ x _{ _{1} } = - 8 \\ x _{ _{2} } = 8$

hope it's correct