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Answer 1

Heya!

x + 1/x = 4 ... Equation i

SQUARING ON BOTH SIDES.

( x + 1/x )² = 16

x² + 1/x² + 2 = 16

x² + 1/x² = 14 ... Equation ii

SQUARING ON BOTH SIDES IN EQUATION II

( x² + 1/x² )² = (14)²

x⁴ + 1/x⁴ = 196 - 2

x⁴ + 1/x⁴ = 194