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OpenStudy (anonymous):
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OpenStudy (anonymous):
Move the -9 to the other side by adding 9 by both sides to get \[x ^{2} + y^{2} + 2x + 4y = 9\] Now we have it in a more general circle form. \[ax ^{2} + by ^{2} + cx + dy = r ^{2}\] So if \[r ^{2} = 9\]\[r=3\]
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