Question

raiz de 8 menos raiz de x igual a 2

Answer 1

$\sqrt{8} - \sqrt{x} = 2 \\ - \sqrt{x} = 2 - \sqrt{8} \\ - x = (2- \sqrt{8} )^2 \\ -x = 4 - 4(8) + 8 \\ -x = -20 \\ x = 20$