Answers

2014-08-11T18:10:00+05:30
A = (3-√5)/(3+√5)
b = (3+√5)/(3-√5)
2a-2b = 2(a-b)
         = 2 [ (3-√5)/(3+√5) - (3+√5)/(3-√5) ]
         = 2 [ (3-√5)² - (3+√5)² ]÷(3²-5)
         = 2 [ -6√5-6√5 ] ÷ 4
         = 2/4 [ -12√5 ]
         = 1/2 [ -12√5 ]
         = -6√5
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2014-08-11T22:06:05+05:30