Math Problem Statement

Use implicit differentiation to find dy/dx. Given equation: x^5 + y^5 = 15xy

Solution

To find dydx\frac{dy}{dx} using implicit differentiation from the equation:

x5+y5=15xyx^5 + y^5 = 15xy

Step-by-Step Solution:

  1. Differentiate both sides of the equation with respect to xx, treating yy as a function of xx. Remember to apply the product rule and chain rule where necessary.

    ddx(x5)+ddx(y5)=ddx(15xy)\frac{d}{dx}(x^5) + \frac{d}{dx}(y^5) = \frac{d}{dx}(15xy)

  2. Differentiate each term:

    • The derivative of x5x^5 is: 5x45x^4
    • The derivative of y5y^5 (using the chain rule since yy is a function of xx) is: 5y4dydx5y^4 \frac{dy}{dx}
    • For the right-hand side, use the product rule for 15xy15xy: ddx(15xy)=15(xdydx+y)\frac{d}{dx}(15xy) = 15 \left( x \frac{dy}{dx} + y \right)
  3. Now, substitute these into the differentiated equation: 5x4+5y4dydx=15(xdydx+y)5x^4 + 5y^4 \frac{dy}{dx} = 15(x \frac{dy}{dx} + y)

  4. Rearrange the terms to collect all dydx\frac{dy}{dx} terms on one side: 5y4dydx15xdydx=15y5x45y^4 \frac{dy}{dx} - 15x \frac{dy}{dx} = 15y - 5x^4

  5. Factor out dydx\frac{dy}{dx}: dydx(5y415x)=15y5x4\frac{dy}{dx}(5y^4 - 15x) = 15y - 5x^4

  6. Solve for dydx\frac{dy}{dx}: dydx=15y5x45y415x\frac{dy}{dx} = \frac{15y - 5x^4}{5y^4 - 15x}

  7. Simplify the expression if possible: dydx=3yx4y43x\frac{dy}{dx} = \frac{3y - x^4}{y^4 - 3x}

This is the derivative dydx\frac{dy}{dx} using implicit differentiation.


Would you like further details or any clarifications?

Related Questions:

  1. How do you apply the product rule in differentiation?
  2. What is the chain rule, and why is it important in implicit differentiation?
  3. Can you find the second derivative d2ydx2\frac{d^2y}{dx^2} from this equation?
  4. How would the process change if yy was a constant?
  5. How does implicit differentiation differ from explicit differentiation?

Tip:

Always carefully apply the product and chain rules when differentiating terms involving both xx and yy, as this helps to avoid common mistakes in implicit differentiation.

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Math Problem Analysis

Mathematical Concepts

Implicit Differentiation
Product Rule
Chain Rule

Formulas

Implicit differentiation formula: dy/dx
Chain Rule: d/dx[f(y)] = f'(y) * dy/dx
Product Rule: d/dx[uv] = u'v + uv'

Theorems

Chain Rule
Product Rule

Suitable Grade Level

Grade 12 or early college (Calculus level)