Question

if x=4-√15 find (x+1uponx)2​

Answer 1

x=4-√15

1/x=1/(4-√15)

=(4+√15)/(4-√15)(4+√15)

=(4-√15)/(4^2-√15^2)

=(4-√15)/(16-15)

=4-√15

(x+1/x)^2

=(4-√15+4+√15)^2

=8^2

=64

Answer 2

answer is 64 if it is (x+1/x)^2

and if it is 2(x+1/x) then answer is 16