Question

answer this question fast

Answer 1

Answer:

$( - 5 + 2 \sqrt{5} - \sqrt{5} ) \\ ( - 5 + \sqrt{5} ). \\ x = (7 + 4 \sqrt{3} ) \\ 1/x = 1/7 + 4 \sqrt{3} \\ 1/7 + 4 \sqrt{3} \times 7 - 4 \sqrt{3} /7 - 4 \sqrt{3} \\ 7 - 4 \sqrt{3}/ (7) {}^{2} - (4 \sqrt{3} ) {}^{2} \\ 7 - 4 \sqrt{3} /49 - 48 \\ 7 - 4 \sqrt{3} \\ x + 1/x = 7 + 4 \sqrt{3} + 7 - 4 \sqrt{3} \\ \: \: \: \: \: \: = 14.$