Chapter 3: Problem 19
Find the derivative. Assume that \(a, b, c,\) and \(k\) are constants. $$f(w)=\left(5 w^{2}+3\right) e^{w^{2}}$$
Short Answer
Expert verified
The derivative is \( f'(w) = (10w^3 + 16w)e^{w^2} \).
Step by step solution
01
Identify the Rule
The function to differentiate is \( f(w) = (5w^2 + 3)e^{w^2} \). It is a product of two functions: \( u(w) = 5w^2 + 3 \) and \( v(w) = e^{w^2} \). We will use the product rule for differentiation, which states: \((uv)' = u'v + uv'\).
02
Differentiate First Function (u)
Differentiate \( u(w) = 5w^2 + 3 \). The derivative of \( 5w^2 \) is \( 10w \), and the derivative of a constant (3) is 0. Therefore, \( u'(w) = 10w \).
03
Differentiate Second Function (v)
Differentiate \( v(w) = e^{w^2} \) using the chain rule. Let \( g(w) = w^2 \), then \( v(w) = e^{g(w)} \). By the chain rule, \( v'(w) = e^{g(w)} imes g'(w) \). Since \( g'(w) = 2w \), we have \( v'(w) = e^{w^2} imes 2w = 2we^{w^2} \).
04
Apply the Product Rule
Substitute \( u(w) \), \( u'(w) \), \( v(w) \), and \( v'(w) \) into the product rule formula: \( (uv)' = u'v + uv' \). This becomes: \[ f'(w) = (10w)e^{w^2} + (5w^2 + 3)(2we^{w^2}) \].
05
Simplify the Expression
Expand and simplify the expression obtained in Step 4: \[ f'(w) = 10we^{w^2} + (10w^3 + 6w)e^{w^2} \]. Combine like terms to get: \[ f'(w) = (10w + 10w^3 + 6w)e^{w^2} = (10w^3 + 16w)e^{w^2} \].
Unlock Step-by-Step Solutions & Ace Your Exams!
-
Full Textbook Solutions
Get detailed explanations and key concepts
-
Unlimited Al creation
Al flashcards, explanations, exams and more...
-
Ads-free access
To over 500 millions flashcards
-
Money-back guarantee
We refund you if you fail your exam.
Over 30 million students worldwide already upgrade their learning with 91Ó°ÊÓ!
Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Product Rule
When you have a function that involves two other functions being multiplied together, you'll often use the product rule to find its derivative. In our case, the function is a product of two separate functions: \( u(w) = 5w^2 + 3 \) and \( v(w) = e^{w^2} \). The product rule provides a formula to differentiate such products:
- The formula is: \((uv)' = u'v + uv'\).
Chain Rule
The chain rule is essential for finding the derivative of a composite function, which is a function within another function. In the given exercise, to differentiate \( v(w) = e^{w^2} \), we need to apply the chain rule because \( e^{w^2} \) is technically a function (exponential) of another function \( w^2 \).Here's how the chain rule works:
- Identify the outer function and the inner function. Here, the outer function is \( e^g \) and the inner function is \( g(w) = w^2 \).
- First, differentiate the outer function while keeping the inner function intact. This gives us \( e^{g(w)} \).
- Then, multiply by the derivative of the inner function \( g'(w) = 2w \).
Differentiation Steps
Breaking down the differentiation into clear steps is crucial for ensuring accuracy. Let's look at the differentiation process for our function \( f(w) = (5w^2 + 3)e^{w^2} \):- **Step 1:** **Identify the type of function** you are dealing with. Recognize that it is a product of two functions and decide to use the product rule.- **Step 2:** **Differentiate each component function** separately. First, \( u(w) = 5w^2 + 3 \), becomes \( u'(w) = 10w \). Then, apply the chain rule to \( v(w) = e^{w^2} \) to get \( v'(w) = 2we^{w^2} \).- **Step 3:** **Apply the product rule formula.** Plug each of the derivatives into the formula, getting: \[ f'(w) = (10w)e^{w^2} + (5w^2 + 3)(2we^{w^2}) \].- **Step 4:** **Simplify the expression.** Expand and combine like terms: \[ f'(w) = (10w^3 + 16w)e^{w^2} \].By dividing your differentiation into these steps, you ensure the process is logical and systematic, reducing the risk of errors. Practice this approach to enhance your calculus proficiency.