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For which values of c is y = x + c a tangent to x² + y² = 8?
Ac = ±2
Bc = ±4
Cc = ±8
Dc = ±16
Answer & Solution
Correct answer: B. c = ±4
With m = 1 and a² = 8, c² = 8(1 + 1) = 16, so c = ±4.
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