plz answer my q.
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if roots are equal
then discriminant = 0
( C-a)^2 =4( b- C)( a-b)
c^2 + a^2 - 2ca = 4ba - 4b^2 - 4ca + 4cb
c^2 + a^2 + 2ca - 4ba + 4b^2 - 4cb = 0
( c+ a)^2 = -4b( b - c - a)
( c+ a)^2 = -4 b^2 +4b( c+a)
( c+ a)^2 + 4b^2 - 4b( c+a) = 0
( c+ a - 2b)^2 = 0
c+ a = 2b
then discriminant = 0
( C-a)^2 =4( b- C)( a-b)
c^2 + a^2 - 2ca = 4ba - 4b^2 - 4ca + 4cb
c^2 + a^2 + 2ca - 4ba + 4b^2 - 4cb = 0
( c+ a)^2 = -4b( b - c - a)
( c+ a)^2 = -4 b^2 +4b( c+a)
( c+ a)^2 + 4b^2 - 4b( c+a) = 0
( c+ a - 2b)^2 = 0
c+ a = 2b
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