x %2B 1/x=3*(text*(x^2*(f*(i*(d*n))))) %2B 1/(x^2) – InterviewSolution

1.

x %2B 1/x=3(text(x^2(f(i(dn))))) %2B 1/(x^2)

Answer»

Given,x + 1/x = 3

Squaring both sides, we get

(x + 1/x)^2 = 9x^2 + 1/x^2 + 2*x*1/x = 9x^2 + 1/x^2 + 2 = 9x^2 + 1/x^2 = 9 - 2x^2 + 1/x^2 = 7

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