10=10
-10=-10
1-11=100-110
adding(11/2)^2
1-11+(11/2)^2=100-110+(11/2)^2
(1)^2-2*11/2*1+(11/2)^2=(10)^2-2*11/2*10+(11/2)^2
using identity
(a-b)^2=a^2+b^2-2ab
(1-11/2)^2=(10-11/2)^2
1-11/2=10-11/2
1=10

it is wrong or right
if it is wrong then why?

• This is wrong.
  
  Simply because
  25 = (5)^2 = (-5)^2
  does not mean
  5=-5
  
  Here 1-11/2 = -(10-11/2) =-9/2
• 12 years agoHelpfull: Yes(1) No(0)