[tex]B^2=256[/tex]
[tex]\mathrm{For\:}x^2=f\left(a\right)\mathrm{\:the\:solutions\:are\:}x=\sqrt{f\left(a\right)},\:\:-\sqrt{f\left(a\right)}[/tex]
[tex]B=\sqrt{256},\:B=-\sqrt{256}[/tex]
[tex]\sqrt{256}[/tex]
[tex]\mathrm{Factor\:the\:number:\:}\:256=16^2[/tex]
[tex]=\sqrt{16^2}[/tex]
[tex]=16[/tex]
[tex]-\sqrt{256} =-16[/tex]
[tex]B=16,\:B=-16[/tex]
by a random romanian guy