exam Maths Puzzle Numerical Ability

Z + 1/Z = 1

Z ^64 + 1/ Z^64 = ?

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exam Other Question

I need help with this problem that is for a quadratic unit but I have no idea how to solve it.

((2t)^(-4))-((5t^(-2))+2=0

Thanks please to solve this equation written as follows:consider:(x^-4)(x+y+1)and x<-2.
since x<-2,what can your say about(x^-4)?