Answers

2015-07-03T12:32:03+05:30
B^2-4ac
=(-a-c)^2-4ac   (b=-a-c)
=a^2+c^2+2ac-4ac
=a^2+c^2-2ac
=(a-c)^2
Hence, 'tis proved that the given expression is a square.

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