Chapter 3: Problem 6
Find \(d y / d x\) by implicit differentiation. \(x^{3} y^{2}-5 x^{2} y+x=1\)
Short Answer
Expert verified
\( \frac{dy}{dx} = \frac{-3x^2 y^2 + 10xy - 1}{2x^3 y - 5x^2} \)
Step by step solution
01
Differentiate both sides with respect to x
Start by differentiating each term of the given equation implicitly with respect to \( x \). For computating implicit differentiation of terms involving both \( x \) and \( y \), apply the product rule and chain rule.- The derivative of \( x^3 y^2 \) is \( 3x^2 y^2 + x^3 \cdot 2y \cdot \frac{dy}{dx} \), using the product rule and the chain rule.- The derivative of \(-5x^2 y\) is \(-10xy - 5x^2 \cdot \frac{dy}{dx} \), again using the product rule and chain rule.- The derivative of \( x \) with respect to \( x \) is 1.- The derivative of the constant 1 is 0.Combining these, the differentiation gives:\[ 3x^2 y^2 + 2x^3 y \frac{dy}{dx} - 10xy - 5x^2 \frac{dy}{dx} + 1 = 0 \]
02
Collect terms with dy/dx
Now we need to collect all the terms that involve \( \frac{dy}{dx} \) to one side of the equation. Start by rearranging your differentiated equation:\[ 2x^3 y \frac{dy}{dx} - 5x^2 \frac{dy}{dx} = -3x^2 y^2 + 10xy - 1 \]
03
Factor out dy/dx
Factor out \( \frac{dy}{dx} \) from the left side of the equation:\[ \frac{dy}{dx} (2x^3 y - 5x^2) = -3x^2 y^2 + 10xy - 1 \]
04
Solve for dy/dx
Finally, solve for \( \frac{dy}{dx} \) by dividing both sides of the equation by \( (2x^3 y - 5x^2) \):\[ \frac{dy}{dx} = \frac{-3x^2 y^2 + 10xy - 1}{2x^3 y - 5x^2} \]
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Product Rule
The product rule is a fundamental tool in calculus when you need to differentiate expressions involving products of two functions. It allows us to tackle complex problems like differentiating the term \( x^3 y^2 \) in our original exercise.For two functions, \( u(x) \) and \( v(x) \), the product rule states:
- \( \frac{d}{dx}[u(x) \cdot v(x)] = u'(x)v(x) + u(x)v'(x) \)
- \( u'(x)v(x) = 3x^2 \cdot y^2 \)
- \( u(x)v'(x) = x^3 \cdot 2y \cdot \frac{dy}{dx} \)
Chain Rule
The chain rule is an essential calculus principle used to differentiate composite functions, such as in our given problem when differentiating terms that include both \( x \) and \( y \).The chain rule states:
- If a function \( y = f(g(x)) \), then its derivative is \( \frac{dy}{dx} = f'(g(x)) \cdot g'(x) \).
Calculus Problem Solving
Solving calculus problems often requires implementing strategies step-by-step, which is vital for solving the implicit differentiation problem here.Begin by differentiating each term:- Differentiate with respect to \( x \), applying both the product and chain rules where necessary.- For example, differentiate \( x^3y^2 \) and \(-5x^2y\) using the product and chain rules.Then, follow these steps:
- Collect all terms containing \( \frac{dy}{dx} \) on one side to isolate it.
- Factor \( \frac{dy}{dx} \) out from these terms.
- Solve for \( \frac{dy}{dx} \) to find the derivative, using algebra to rearrange the equation if needed.