x+1/x=9 then find x^4+1/x^4=
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If (X+1/x)=9,
Then (x+1/x)^2=81.
(X^2 + 1/x^2 + 2)=81
X^2 + 1/x^2=81-2=79
(x^2 + 1/x^2)^2=79^2=6241
x^4 + 1/x^4 + 2=6241
x^4 + 1/x^4=6241-2=6239
Then (x+1/x)^2=81.
(X^2 + 1/x^2 + 2)=81
X^2 + 1/x^2=81-2=79
(x^2 + 1/x^2)^2=79^2=6241
x^4 + 1/x^4 + 2=6241
x^4 + 1/x^4=6241-2=6239
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