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22 June, 02:17

What is the radius of a circle whose equation is x2 + y2 + 8x - 6y + 21 = 0? units

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  1. 22 June, 04:28
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    Step-by-step explanation:

    x²+8x+y²-6y = - 21;

    (x+4) ² + (y-3) ²-25 = - 21;

    (x+4) ² + (y-3) ²=2²;

    it means r²=2²; ⇒ r=2.
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