Answers

2016-04-27T21:25:32+05:30
2016-04-28T12:00:02+05:30
Given
2(x² +1) = 5x
 2x²+2= 5x
 2x²-5x+2 =0
2x²-4x-x+2 = 0
2x(x-2)-1(x-2) = 0
(2x-1)(x-2) =0
2x=1 and x  = 2
x= 1/2 and x = 2
 (1) x - 1/x
     case(i) : 1/2 - 1/(1/2)
                 = 1/2 - 2
                 =  - 3/2
   case (ii) : 2 -1/2
                 = -3/2
(2) x³ - 1/x³
     case(i) : (1/2)³ - 1/(1/2)³
                 = 1/8 - 8
                 = -7.5
   case(2) : 2³- 1/2³
                 = 8-1/8
                 = 7.5


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