1.

lfr + 1 = 9, find the value ofx4 + 14

Answer»

x + 1/x = 9

Sqauring both sides

x² + 1/x² + 2 = 81

x² + 1/x² = 79

Sqauring again

x⁴ + 1/x⁴ + 2 = 79²

x⁴ + 1/x⁴ = 6241 - 2 = 6239



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