How is it possible?Only valid answers are accepted Let a = b
Then,we can write as:
Now,adding (-b^2) both sides
[Using identity a^2 - b^2 = (a+b)( a-b) and on the R.H.S taking b as common]
b = b+b
[Because a = b]
2b = b
Now,put any number in value of b, suppose we put 1,then:
2×1 = 1
2=1
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