Question

solve it : answer fast..please

Answer 1

Take whole square it's easy

Answer 2

$(x + \frac{1}{x} ) {}^{2} = x {}^{2} + 2 \times x \times \frac{1}{x} + ( \frac{1}{x} ) { }^{2} \\ (x + \frac{1}{x} ) {}^{2} = x {}^{2} + \frac{1}{x} {}^{2} + 2 \\ (x + \frac{1}{x} ) {}^{2} = 23 + 2 \\ (x + \frac{1}{x} ) {}^{2} = 25 \\ x + \frac{1}{x} = \sqrt{25} \\ x + \frac{1}{x} = 5$