Digital SAT Math Practice Question #1636
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r^2 = 24 + (-6/2)^2 + (8/2)^2 = 24 + 9 + 16 = 49 -> r = 7.
Complete the square for x and y: \((x^2 - 6x + 9) + (y^2 + 8y + 16) = 24 + 9 + 16 = 49\). In standard form \((x - 3)^2 + (y + 4)^2 = 49 = r^2\). Thus \(r = \sqrt{49} = 7\)....
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