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Circles

Review question

When does the origin lie inside this circle?
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Ref: R7599

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Question

The origin lies within the circle with equation \[x^2+ax+y^2+by=c\] precisely when

\(c > 0\)
\(a^2 + b^2 > c\)
\(a^2 + b^2 < c\)
\(a^2 + b^2 > 4c\)
\(a^2 + b^2 < 4c\).