Tfx + =V5, find the value of x² + 2 – InterviewSolution

1.

Tfx + =V5, find the value of x² + 2

Answer»

x+ 1/x=V5; ( x + 1 / x)^2= x^2+1/x^2+2x(1/x) = x^2+1/x^2+2,; ( x+1/x)^2-2= x^2 + 1/ x^2

( x^2+1/x^2)=(x+1/x)(x+1/x)=V5 x V5=5

3 is right answer of your question

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