Question

What is the condition for the circles
x² + y² +2gx +2 fy+c=0 x² + y2 +2g'x+2f'y+c' = 0
intersect orthogonally
2(gg' + ff') = c+c
O
2gg' + ff.' =c+c'
O
gg' + ff' =c+c'
O
gg' + ff' = 2(c+c)​

Answer 1

Answer:

a

Step-by-step explanation:

2(gg'+ff')=c+c'

thank me please