Question

(k+1/k)^2=16, then k^2+1/k^2

Answer 1

the expansion of (k + 1/k)^2 = 16

is

k^2 + 2 + 1/k^2 = 16


you should be able to find k^2 + 1/k^2 now...

Answer 2

i got k^2+1/k^2=14

Answer 3

correct.... well done