If (x+1x)=5, then (x2+1x2)=? (a) 25 (b) 27 (c) 23 (d) 25125
x+1x=5 Squaring both sides, (x+1x)2=(5)2⇒x2+1x2+2=25x2+1x2=25−2=23
If x+1x then x2+1x2=