Question

1.)If x-1/x=7, evaluate the following:-
i). x²+1/x²
ii). x⁴+1+1/x⁴


2.) If x²+1/x²=23, Evaluate:-
i). x+1/x
ii). x-1/x



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Answer 1

[-1]^2+1/1^2=1+1=2
7^4+1+1/7^4=2401+1+1/2401=2402+ 0.000416493127863=2402.000416493127863