Math Problem Statement

but now you're on board the spaceship #1725486563, and the captain is asking to solve "ZP" (Z Planet) problem (you know what it means when captain is "asking"... that's an order):

Use the chain rule to find the derivative of f(x)=2e10x8+3x52e^{10x^8+3x^5}

f'(x)= 

!!! The challenge is that the Chain Rule on Earth, f(g(x))'=f'(g)g'(x) ,  is "twisted" on Z planet as the following:

 f(g(x))'= f'(g)/g'(x)    (all the other rules have not been changed).

Solution

It looks like we're aboard spaceship #1725486563, solving the "Z Planet" problem where the Chain Rule is modified. On Earth, the Chain Rule is typically:

ddx(f(g(x)))=f(g(x))g(x)\frac{d}{dx} \left( f(g(x)) \right) = f'(g(x)) \cdot g'(x)

However, on Z Planet, it's twisted:

ddx(f(g(x)))=f(g(x))g(x)\frac{d}{dx} \left( f(g(x)) \right) = \frac{f'(g(x))}{g'(x)}

Given function:

f(x)=2e10x8+3x5f(x) = 2e^{10x^8 + 3x^5}

Let's break it down.


Step 1: Identify the outer and inner functions.

The given function f(x)f(x) is of the form f(x)=2eg(x)f(x) = 2e^{g(x)}, where:

g(x)=10x8+3x5g(x) = 10x^8 + 3x^5

Step 2: Earth version of the derivative

First, calculate the derivative using Earth’s Chain Rule:

f(x)=2ddx(eg(x))f'(x) = 2 \cdot \frac{d}{dx} \left( e^{g(x)} \right)

The derivative of eg(x)e^{g(x)} with respect to xx is:

ddx(eg(x))=eg(x)g(x)\frac{d}{dx} \left( e^{g(x)} \right) = e^{g(x)} \cdot g'(x)

Now, compute g(x)g'(x):

g(x)=ddx(10x8+3x5)=80x7+15x4g'(x) = \frac{d}{dx} \left( 10x^8 + 3x^5 \right) = 80x^7 + 15x^4

Thus, the Earth version of the derivative is:

f(x)=2e10x8+3x5(80x7+15x4)f'(x) = 2 \cdot e^{10x^8 + 3x^5} \cdot (80x^7 + 15x^4)

Step 3: Z Planet version of the derivative

According to Z Planet’s twisted Chain Rule, we divide by g(x)g'(x) instead of multiplying by it. Thus, on Z Planet:

f(x)=2e10x8+3x580x7+15x4f'(x) = \frac{2 \cdot e^{10x^8 + 3x^5}}{80x^7 + 15x^4}

This is the derivative on Z Planet.


Final answer:

f(x)=2e10x8+3x580x7+15x4f'(x) = \frac{2e^{10x^8 + 3x^5}}{80x^7 + 15x^4}


Would you like more details or have any questions?

5 Related Questions:

  1. How would the derivative change if the exponent was a polynomial of higher degree?
  2. What is the significance of the Chain Rule in calculus?
  3. How would the Earth Chain Rule handle nested functions (e.g., eeg(x)e^{e^{g(x)}})?
  4. What happens if you take the second derivative using Z Planet's rules?
  5. How does the Z Planet rule affect implicit differentiation?

Tip:

Always double-check if the inner function's derivative is computed correctly, especially on Z Planet, where the rules twist familiar patterns.

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Math Problem Analysis

Mathematical Concepts

Calculus
Differentiation
Exponential Functions
Chain Rule

Formulas

Earth Chain Rule: f'(g(x)) = f'(g(x)) * g'(x)
Z Planet Chain Rule: f'(g(x)) = f'(g(x)) / g'(x)
Derivative of e^g(x): d/dx[e^g(x)] = e^g(x) * g'(x)

Theorems

Chain Rule

Suitable Grade Level

Undergraduate Calculus