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Find the tangent to x² + y² = 25 at the point (3, 4).
A4x + 3y = 25
B3x − 4y = 25
C3x + 4y = 7
D3x + 4y = 25
Answer & Solution
Correct answer: D. 3x + 4y = 25
Using xx₁ + yy₁ = r² with (3, 4) and r² = 25 gives 3x + 4y = 25.
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