Question

$( \sqrt{x} - 1) = 8 - \sqrt{28}$

Answer 1

$\sqrt{x} - 1 = 8 - \sqrt{28} \\ \\ \sqrt{x} = 8 - \sqrt{28} + 1 \\ \\ \sqrt{x} = 9 - \sqrt{28} \\ \\ \\ x = (9 - \sqrt{28})^2 \\ \\ x = 81 + 28 - 18\sqrt{28} \\ \\ x = 109 - 18\sqrt{4 \times 7} \\ \\ x = 109 - 18 \times 2\sqrt{7} \\ \\ x = 109 - 36\sqrt{7}$