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a. X + ¹/x
√x+1/√x =3 kedua ruas kuadratkan
(√x+1/√x) (√x+1/√x) =3²
x+x^0 +x^0 +x^-1=9
x +1+1+1/x =9
x+1/x=9-2
x+1/x=7
b. X² + ¹/x²
x+1/x=7 kuadratkan kedua ruas
x²+x^0+x^0+x^-2=7²
x²+1+1+1/x²=49
x²+1/x²=49-2
x²+1/x²=47
c. X - ¹/x