Answer :

Given that,

x + = 9


Squaring both sides, we get


(x + )2 = 92


x2 + + 2 = 81


x2 + = 79


Again,


Squaring both sides, we get


(x2 + )2 = 792


x4 + + 2 = 6241


x4 + = 6239


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