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## Answers

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