please explain this proof i can't understand it

Asked by sonaisha | 6th Mar, 2009, 01:02: PM

Expert Answer:

We have a-c=b-d

There is one case when both b and d areperfect squares so that both lhs and rhs are rational and thus solvable. Otherwise we have: a-c=b-d=0

Hence we have,a=c and b=d

Answered by  | 8th Mar, 2009, 09:43: PM

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