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CUET · MATHS · PYQ PAPER 2023

The slope of the normal to the curve \(y=x^3+3 x-2\) at its point of intersection with y-axis is:

  1. A 3
  2. B -3
  3. C \(\frac{1}{3}\)
  4. D \(-\frac{1}{3}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(-\frac{1}{3}\)

Step-by-step Solution

Detailed explanation

Intersection with y-axis: \(x=0 \implies y = (0)^3+3(0)-2 = -2\). Point is \((0,-2)\). \(\frac{dy}{dx} = 3x^2+3\). Slope of tangent at \((0,-2)\): \(m_t = 3(0)^2+3 = 3\). Slope of normal: \(m_n = -\frac{1}{m_t} = -\frac{1}{3}\).
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