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JEE Mains · Maths · STD 12 - 6. Application of derivatives

वक्र \(y=54 x^5-135 x^4-70 x^3+180 x^2+210 x\) पर उन बिन्दुओं, जिन पर अभिलंब, रेखा \(x+90 y+2=0\) के समांतर है, की संख्या है:

  1. A \(2\)
  2. B \(3\)
  3. C \(4\)
  4. D \(0\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(4\)

Step-by-step Solution

Detailed explanation

Normal of line is parallel to line \(x+90 y+2=0\) \(m _{ N }=-\frac{1}{90}\) \(-\left(\frac{ dx }{ dy }\right)_{\left(x_1 y_1\right)}=-\frac{1}{90} \Rightarrow\left(\frac{ dy }{ dx }\right)_{\left(x_1 y_1\right)}=90\) Now, \(\frac{d y}{d x}=270 x^4-540 x^3-210 x^2+360 x+210=90\)…
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