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  • Explain solution for RD Sharma maths Class 12 Chapter 15 Tangents and Normals Exercise Multiple Choice Question ,Question 35 maths textbook solution.

Explain solution for RD Sharma maths Class 12 Chapter 15 Tangents and Normals Exercise Multiple Choice Question, Question 35 maths textbook solution.

Answers (1)

Answer : (d) is the correct option

Hint : \text { Parallel to } x \text {-axis } \Rightarrow y=0

Given : y=x^{3}-12 x+18

Solution :

y=x^{3}-12 x+18                                (1)

Differentiating (1) w.r.t x, we get

\frac{d y}{d x}=3 x^{2}-12

Since it's parallel to x-axis

\begin{aligned} &\frac{d y}{d x}=0 \\ &3 x^{2}-12=0 \\ &x^{2}=4 \\ &x=\pm 2 \end{aligned}

When x=2

\begin{aligned} &y=(2)^{3}-12(2)+18 \\ &=8-24+18 \\ &=2 \end{aligned}

When x = -2

\begin{aligned} &y=(-2)^{3}-12(-2)+18 \\ &=-8+24+18 \\ &=34 \end{aligned}

The points are (2,2) and (-2,34)

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