An interesting question for smart people! You should know this trick

Subscribe for more
#maths
#olympiad
#mathematics

[@iamatharvayt]

4 or -2 and as a jee aspirant did mentally

[@tunglin]

X(X-(2/X)-1)=0=X^2-2-X=(X-2)(X+1)
-> X=2 or -1
ans: 2+(2/2)+1=4 or -1+(2/-1)+1=-2

[@2sljmath]

Yes.Thank you.🙏