Question

If x=4+√(15) find the value of (x+1/x)2

Answer 1

2(4+√15+1/4+√15) 2(5+√15×4-√15/4+√15×4-√15) 2(20-5√15+4√15-15/16-15) 2(5-√15/1) 10-2√15