Question

if x-1/x=4 then x2+1/x2 is​

Answer 1

hey mate

here is your answer

${(x - \frac{1}{x}) }^{2} = {x}^{2} - 2 + \frac{1}{ {x}^{2} } \\ 16 + 2 = {x}^{2} + \frac{1}{ {x}^{2} } \\ 18 = {x}^{2} + \frac{1}{ {x}^{2} }$

hope it helps