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The circle x² + y² + 8x + 10y - 8 = 0 has which centre and radius?
A(4, 5), radius 7
B(4, 5), radius 49
C(-4, -5), radius 49
D(-4, -5), radius 7
Answer & Solution
Correct answer: D. (-4, -5), radius 7
Completing squares gives (x + 4)² + (y + 5)² = 49, so the centre is (-4, -5) and the radius is 7.
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