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Quick questions on Coordinate geometry: lines, circles and parametric curves - AQA A-Level Maths

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What are sign errors completing the square for circles?
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The centre is (a,b)(a, b) read from (x−a)2+(y−b)2(x - a)^2 + (y - b)^2, so (x−3)2(x - 3)^2 gives +3+3 and (y+2)2(y + 2)^2 gives −2-2.

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