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  • Need Solution for R.D.Sharma Maths Class 12 Chapter 15 Tangents and Normals Exercise 15.1 Question 19 Sub Question 1 Maths Textbook Solution.

Need Solution for R.D.Sharma Maths Class 12 Chapter 15 Tangents and Normals Exercise 15.1 Question 19 Sub Question 1 Maths Textbook Solution.

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Answer:\text { The points at which the tangents are parallel to } \mathrm{x} \text { -axis are }(0,4) \&(0,-4)

Hint:\text { The slope of the tangent is the limit of } \frac{\Delta y}{\Delta x} \text { as } \Delta x \text { approaches zero. }

Given: \frac{x^{2}}{9}+\frac{y^{2}}{16}=1 \quad \rightarrow(1)

Solution:\text { Differentiating eqn(1) with respect to } x

\begin{aligned} &\frac{d}{d x}\left(x^{n}\right)=n x^{n-1}, \frac{d}{d x}(\text { constant })=0 \\ &\frac{2 x}{9}+\frac{2 y}{16} \frac{d y}{d x}=0 \\ &\frac{d y}{d x}=\frac{-16}{9} \frac{x}{y} \end{aligned}

\text { Now the tangent is parallel to the } \mathrm{x} \text { -axis if the slope of the tangent is zero }

\frac{-16}{9} \frac{x}{y}=0 \text { which is possible if } x=0

Then,

\frac{x^{2}}{9}+\frac{y^{2}}{16}=1 \text { for } x=0

\begin{aligned} &y^{2}=16 \\ &y=\pm 4 \end{aligned}

\text { Thus the points at which the tangents are parallel to } \mathrm{x} \text { -axis are }(0,4) \&(0,-4)

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