If the circle (x^2+y^2+2,gx+2fy+=0,) and (x^2+y^2+2g'x+2f'y)... | Mathematics | SolveeIt | Solveeit

Today, August 24

Question

If the circle $x^2+y^2+2\,gx+2fy+=0,$ and $x^2+y^2+2g'x+2f'y$ touch each other, then

A

fg=f'g'

B

g=fg'

C

ff ' = gg'

D

none of these

Answer

g=fg'

Explanation

Solution

Answer (b) g=fg'