Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Can you help me with this problem with step by step explanation, please? Thank you:)
![### Using Implicit Differentiation to Find dy/dx
Given the equation:
\[ x^2 + 5xy + y^2 = 0 \]
We are asked to use implicit differentiation to find \(\frac{dy}{dx}\).
The process of implicit differentiation involves differentiating both sides of the equation with respect to \( x \), while treating \( y \) as a function of \( x \).
Step-by-step differentiation:
1. Differentiate \( x^2 \):
\[ \frac{d}{dx}(x^2) = 2x \]
2. Differentiate \( 5xy \) using the product rule (\( u \cdot v \) where \( u = 5x \) and \( v = y \)):
\[ \frac{d}{dx}(5xy) = 5y + 5x \frac{dy}{dx} \]
3. Differentiate \( y^2 \) using the chain rule:
\[ \frac{d}{dx}(y^2) = 2y \frac{dy}{dx} \]
Now, combining these results, we differentiate the entire equation:
\[ 2x + 5y + 5x \frac{dy}{dx} + 2y \frac{dy}{dx} = 0 \]
Next, solve for \(\frac{dy}{dx}\):
1. Group all the \(\frac{dy}{dx}\) terms on one side:
\[ 5x \frac{dy}{dx} + 2y \frac{dy}{dx} = -2x - 5y \]
2. Factor out \(\frac{dy}{dx}\):
\[ \frac{dy}{dx}(5x + 2y) = -2x - 5y \]
3. Finally, solve for \(\frac{dy}{dx}\):
\[ \frac{dy}{dx} = \frac{-2x - 5y}{5x + 2y} \]
Thus, the implicit differentiation gives us:
\[ \boxed{\frac{dy}{dx} = \frac{-2x - 5y}{5x + 2y}} \]
This equation describes the slope of the tangent line to the curve \( x^2 + 5xy + y^2 = 0 \) at any point \((x, y)\).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc8354011-a539-4dd4-a237-9321c3b17a7b%2F0702936d-6e14-4730-bbc3-70aba87d9233%2Frykbp6j_processed.png&w=3840&q=75)
Transcribed Image Text:### Using Implicit Differentiation to Find dy/dx
Given the equation:
\[ x^2 + 5xy + y^2 = 0 \]
We are asked to use implicit differentiation to find \(\frac{dy}{dx}\).
The process of implicit differentiation involves differentiating both sides of the equation with respect to \( x \), while treating \( y \) as a function of \( x \).
Step-by-step differentiation:
1. Differentiate \( x^2 \):
\[ \frac{d}{dx}(x^2) = 2x \]
2. Differentiate \( 5xy \) using the product rule (\( u \cdot v \) where \( u = 5x \) and \( v = y \)):
\[ \frac{d}{dx}(5xy) = 5y + 5x \frac{dy}{dx} \]
3. Differentiate \( y^2 \) using the chain rule:
\[ \frac{d}{dx}(y^2) = 2y \frac{dy}{dx} \]
Now, combining these results, we differentiate the entire equation:
\[ 2x + 5y + 5x \frac{dy}{dx} + 2y \frac{dy}{dx} = 0 \]
Next, solve for \(\frac{dy}{dx}\):
1. Group all the \(\frac{dy}{dx}\) terms on one side:
\[ 5x \frac{dy}{dx} + 2y \frac{dy}{dx} = -2x - 5y \]
2. Factor out \(\frac{dy}{dx}\):
\[ \frac{dy}{dx}(5x + 2y) = -2x - 5y \]
3. Finally, solve for \(\frac{dy}{dx}\):
\[ \frac{dy}{dx} = \frac{-2x - 5y}{5x + 2y} \]
Thus, the implicit differentiation gives us:
\[ \boxed{\frac{dy}{dx} = \frac{-2x - 5y}{5x + 2y}} \]
This equation describes the slope of the tangent line to the curve \( x^2 + 5xy + y^2 = 0 \) at any point \((x, y)\).
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