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2 November, 05:33

Find the radius of the circle whose equation is x² - 10x + y² - 10y = - 1 a) 1 b) 7 c) 49

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  1. 2 November, 07:43
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    After completing the square, the right side of the equation is always the radius squared, so you just need to square root the right side.

    (x - 5) ² + (y - 5) ² = 49

    Square root of 49 = 7.

    Your answer is 7.
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