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22 August, 16:54

A circle has center (5,-4) and radius 8. Which gives the equation for the circle?

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  1. 22 August, 17:34
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    Use (x - h) ^2 + (x - k) ^2 = r^2.

    Note: (h, k) is the center of the circle.

    (h, k) = (5, - 4). This means h = 5 and k = - 4.

    Let r = radius

    We now plug and chug.

    (x - 5) ^2 + (y - (-4)) ^2 = (8) ^2

    (x - 5) ^2 + (y + 4) ^2 = 64

    Done.
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