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Q.

If x=7−43,then x+1x is equal to:

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a

2

b

37

c

4

d

47

answer is C.

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Detailed Solution

7−43=22+(3)2−43                           =(2−3)2∴ x=7−43=2−3and 1x=12−3=2+3Thus, x+1x=4
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