Use implicit differentiation to find dy/dx. x2 + 5xy + y = 0 + dy %D dx

Calculus: Early Transcendentals
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Author:James Stewart
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Chapter1: Functions And Models
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### 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 \((x, y)\).
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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