Question
If one of the circles $x^{2}+y^{2}+2 a x+c=0$ and $x^{2}+y^{2}+$ $2 b x+c=0$ lies within the other, then(A) $a b<0$(B) $a b>0$(C) $c \leq 0$(D) $c>0$
Step 1
The centers of these circles are $(-a,0)$ and $(-b,0)$ respectively. Show more…
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