Question 751118: Find the equation of the circle that is tangent to the x-axis and the circle is at (-7,4).
Answer by nerdybill(7384)   (Show Source):
You can put this solution on YOUR website! Find the equation of the circle that is tangent to the x-axis and the circle is at (-7,4).
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Plotting the center on graph, we can see that the distance between the center and the x-axis is 4. Therefore, the radius is 4.
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Standard form of a circle is:
(x-h)^2 + (y-k)^2 = r^2
where
(h,k) is the center and r is the radius
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plug in our data:
(x-(-7))^2 + (y-4)^2 = 4^2
(x+7)^2 + (y-4)^2 = 16
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