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x2 -√5x + 1 = 0
বা, x2 +1 = √5x
বা, x2 + 1 /x = √5
বা, x2/x + 1/x = √5
বা, x+1/x = √5
বা, (x+1/x)2= (√5)2
বা, (x-1/x)^2 + 4.x.1/x = 5
বা, (x-1/x)^2 = 5-4
বা, (x-1/x)^2 =1
বা, x-1/x = +1 বা -1
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