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Is point (-1, 4) on the circle with radius 4 and center at (-3, 1)?

Question:

Is point (-1, 4) on the circle with radius 4 and center at (-3, 1)?

Answer:

An equation for the circle is (x+3)^2+(y-1)^2=16. Substitute the point (-1,4) into the expression on the left side to get (-1+3)^2+(4-1)^2=9+9=18. Since this value is not equal to the right side, which is 16, the point (-1,4) is not on the circle.
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