Question

x = 4+ root 15 then find (x + 1/x)^2 say fast urgent
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Answer 1

x=4+√15=7.89

Now,

(x+1/x)^2

=(7.89+1/7.89)^2

=64.27

Answer 2

As x = 4 + root 15; then,

${( \frac{x + 1}{x} )}^{2} \\ = {( \frac{4 + \sqrt{15} + 1 }{4 + \sqrt{15} }) }^{2} \\ = \frac{25 + 10 \sqrt{15} + 15}{16 + 8 \sqrt{15} + 15} \\ = \frac{40 + 10 \sqrt{15} }{31 + 8 \sqrt{15} } \\ = 40 - 10 \sqrt{15}$

HOPE THIS COULD HELP!!!