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Maths Puzzle
If x=√5-1÷√5+1 and xy =1, then the value of x2 +y2-3xy is:
(A) 4
(B) 3
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self Other Question
A is twice as good a workman as B. Together they finish a piece of work in 18 days. Then B can do a similar work by himself in :
(A) 54 days
(B) 27 days
If x
=root5-1÷root5+1 and xy =1, then the value of x2 +y2-3xy is:
(A) 4
(B) 3