Precalculuscheck answer please
posted by Lucy .
Write the standard form of the equation of the circle that is tangent to the line x=3 and has center at (2,7).
Answer: (x+2)^2+(y+7)^2=49
Is this correct?

did you make a quick sketch?
should it not be obvious from your sketch, that the radius would be 5 ?
so the equation should have been:
(x+2)^2 + (y+7)^2 = 25
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