exam Maths Puzzle Numerical Ability

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)?

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exam Other Question

Z + 1/Z = 1

Z ^64 + 1/ Z^64 = ? The lengths of diagonals of a rhombus are in the ratio 2:1. If the perimeter of the rhombus is 20, find the sum of the lengths of the diagonals.

I know that each side is 5. ( 20/4=5)
I know the diagonals are perpendicular to each other.