Solving f(x) = 5e^(2x+1) with Chain Rule

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In summary, to find the derivative of f(x) = 5e^(2x+1), we can use the chain rule, power rule, and constant multiple rule. By setting u = 2x+1, we can rewrite the equation as f(x) = 5e^u and find the derivative of f(u) = e^u. Then, using the constant multiple rule, we can multiply the resulting derivative by 5 to get f'(x) = 10e^(2x+1). This is the correct way to find the derivative of f(x).
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char808
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Homework Statement



f(x) = 5e^(2x+1)

Homework Equations



Chain rule, power rule and constant multiplies rule

The Attempt at a Solution



f(x) = 5e^(2x+1) = 5f(x)

e^(2x+1)

f(u) = e^x f'(u) = e^x
g(x)= 2x+1 g'(x) = 2

5f'(x) = 2e^2x+1

=10e^2x+1


Is that the correct way to go about that?
 
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  • #2
Your answer is correct, but you should write it like this

f(x)=e2x+1

u=2x+1, u'
f(u)=eu, f'(u)=eu

f'(x)=f'(u)*u' = 2eu=2e2x+1


So that f(x)=5e2x+1, f'(x) = 5*2e2x+1=10e2x+1

You used variables like 'u' and 'g' in a confusing manner.
 

FAQ: Solving f(x) = 5e^(2x+1) with Chain Rule

What is the purpose of solving f(x) = 5e^(2x+1) with Chain Rule?

The purpose of solving this equation with Chain Rule is to find the derivative of f(x) with respect to x. This is useful in understanding the rate of change of the original function.

What is the Chain Rule?

The Chain Rule is a method used to find the derivative of a composite function, where the inner function is a function of another variable. It allows us to break down the complex function into smaller, more manageable parts.

How do I apply the Chain Rule to solve f(x) = 5e^(2x+1)?

To apply the Chain Rule, we first identify the inner function, which in this case is 2x+1. Then, we find the derivative of the outer function, which is e^x. Finally, we multiply the two derivatives together to get the final result: f'(x) = 10e^(2x+1).

Why is the Chain Rule important in calculus?

The Chain Rule is important in calculus because it allows us to find the derivatives of complex functions, which are often encountered in real-world applications. It also helps us understand the relationship between different variables and how they affect each other.

Are there any common mistakes to avoid when using the Chain Rule?

One common mistake to avoid when using the Chain Rule is to forget to multiply the derivative of the outer function by the derivative of the inner function. Another mistake is to mix up the order of the functions, as the Chain Rule only works if the outer function is applied to the result of the inner function.

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