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If two cricles x^2 + y^2 + 2gx + 2fy = 0...

If two cricles `x^2 + y^2 + 2gx + 2fy = 0` and` x^2 +y^2 + 2g'x + 2f'y = 0` touch each other, then

A

a)ff' = gg'

B

b)f`g = fg'

C

c)fg = fg'-

D

d)`ff = gg'^2`.

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UNITED BOOK HOUSE-MODEL QUESTION PAPERS-SET 13-EXERCISE
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