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Slope of Tangent

What is the equation of the normal to the curve x^2 + y^2 = 25 at (4, 3)?

Problem
What is the equation of the normal to the curve $x^2 + y^2 = 25$ at (4, 3)?

A.   $4x + 3y = 0$ C.   $3x + 4y = 0$
B.   $3x - 4y = 0$ D.   $4x - 3y = 0$

 

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