by surya.anem Thu Nov 17, 2011 2:24 am
Hi,
Not sure if my explanation is correct. Infact if i had been faced this problem i wouldnt have definitely tried this way. But tried to backtrace based on your answer.
a^2 - b^2 = 0
so a^2 = b^2 -> a = b or - b
Actually the above will happen only if a and b are both zeroes.
Infact without any clues may be we can guess that.
1)ab=0, we know that a=b or -b, substituting we get a = 0
2) b=-b only for 0. Once again substituting above..we get a=0.
Thanks
Surya