Question

${x }^{2} + \frac{1}{{x}^{2} } when x - \frac{1}{x} = \sqrt{5}$
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Answer 1

Answer:

given

x-1/x=√5

formula

(x-1/x)^2=x^2+1/x^2-2

(√5)^2=x^2+1/x^2-2

5+2=x^2+1/x^2

=> x^2+1/x^2=7 ans....