question 41,42,43
41   If   x 4 + 1 x 4 = 623 ,     then   x + 1 x = a 27 b 25 c 3 3 d - 3 3 42     if   x 2 + 1 x 2 = 102 ,     then   x - 1 x = a 8 b 10 c 12 d 13   43 .   If   x 3 + 1 x 3 = 110 ,     then   x + 1 x = a 5 b 10 c 15 d none   of   these
 

Dear Students,Q.41) x4+1x4=623Add 2 both side;= x4+1x4+2=623+2=(x2)2+1(x2)2+2×(x2)×1x2=25^2=(x2+1x2)2=252=x2+1x2=25similarly;Add 2 both side,=x2+1x2+2=25+2=(x+1x)2=27=x+1x=27=x+1x=33------------------------Q.42) x2+1x2=102sunstract 2 both side;= x2+1x2-2=102-2it is in the form of (a-1a)2=a2+1a2-2a1a=x2+1x2-2x1x=100=(x-1x)2=102=x-1x=10Kindly ask the remaining query in different thread.Regards

 

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