Question

if x=4-root 14 /2 what is the value of x^2+1/x^2 ?​

Answer 1

Answer: x = 4 - √15

x² = 16 + 15 - 8√15 = 31 - 8√15

1/x² = 1/31 - 8√15 = (31+8√15) / 961-960 = 31+8√15

x² + 1/x² = 62