if x^4+1/x^4=194 then x^3+1/x^3=?
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x^4+1/x^4 =(x^2+1/x^2)^2-2=194
x^2+1/x^2=14
in this way x+1/x=4
now, x^3+1/x^3=64-12=52
x^2+1/x^2=14
in this way x+1/x=4
now, x^3+1/x^3=64-12=52
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