this

$\sqrt(12.5(12.5-8)(12.5-10)(12.5-7))$

$\sqrt(12.5(4.5)(12.5-10)(12.5-7))$

$\sqrt(12.5(4.5)(2.5)(12.5-7))$

$\sqrt(12.5(4.5)(2.5)(5.5))$

$\sqrt(56.25(2.5)(5.5))$

$\sqrt(140.625(5.5))$

$\sqrt(773.4375)$

$27.8107443266087361 & -27.8107443266087361$