need help

3h^2=512        [ /3

h^2 = 160.666...

h = √160.666...

h₁ = 13.0639452949

h₂ = - 13.0639452949

$\color{red}3h^2=512$

$\color{orange}h^2=\frac{512}{3}$

$\color{lime}h^2+0h-\frac{512}{3}=0$

Using quad. formula

$\color{blue}h_1=13.063945294843617$

$\color{purple}h_2=-13.063945294843617$