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Question

Tick (✓) the correct answer:
If x-1x=6, then x2+1x2=?
(a) 36
(b) 38
(c) 32
(d) 36136

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Solution

(b) 38

x-1x= 6Squaring both the sides:x-1x2= 62x2+1x2-2x1x= 36x2+1x2-2 =36x2+1x2=36+2x2+1x2= 38

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