give me answer please
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a²+b²=(a+b)²⁻2ab
∴x⁴+1/x⁴=[1/x²+x²]²-2
[(1/x+x)²-2]²-2
=[(9)²-2]²-2
=79²-2
=6241-2
ans=6239
∴x⁴+1/x⁴=[1/x²+x²]²-2
[(1/x+x)²-2]²-2
=[(9)²-2]²-2
=79²-2
=6241-2
ans=6239
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