Question

(√2-1)(x²+1/x²+7√2)=?

Answer 1

$(\sqrt{2} - 1)(x^2 + \frac{1}{x^2} + 7\sqrt{2}) \\ \\ = x^2\sqrt{2} + \frac{\sqrt{2}}{x^2} + 14 - x^2 - \frac{1}{x^2} - 7\sqrt{2}$