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What is the normal to y² = 4ax at the point (at², 2at)?
Aty + x = 2at + at³
By + tx = 2at - at³
Cy + tx = 2at + at³
Dy - tx = 2at + at³
Answer & Solution
Correct answer: C. y + tx = 2at + at³
The tangent slope is 1/t, so the normal slope is -t and the line through (at², 2at) is y + tx = 2at + at³.
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