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April 18, 2015

April 18, 2015

Posted by **Shane** on Sunday, September 1, 2013 at 2:01am.

- maths -
**Graham**, Sunday, September 1, 2013 at 2:15amRearrange into incomplete quadratics:

(x² + 2x) + (y² - 2y) = 1

Complete the squares:

(x² + 2x + 1) + (y² - 2y + 1) = 1 + 1 + 1

Express in the required form:

(x + 1)² + (y - 1)² = (√3)²

Thus: h = -1, k = 1, r = √3

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