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Calculus – Product Rule




 
Related Topics:
More Lessons for Calculus, Math Worksheets

How to use the product rule to find the derivative of the product of two functions?

What is The Product Rule?

The Product Rule says that the derivative of a product of two functions is the first function times the derivative of the second function plus the second function times the derivative of the first function.

What is the Product Rule Formula?

If f and g are both differentiable, then

You may want to remember the Product Rule as follows:

Let u = f(x) and v = g(x) then

How to use the Product Rule?

Example:

Find f’(x) if f(x) = (6x3)(7x4)

Solution:

Using the Product Rule, we get

Example:

Given f(x) = (3x2 – 1)(x2 + 5x +2), find the derivative of f(x).

Solution:

Using the Product Rule, we get




When to use the Product Rule?
We use the product rule when we need to find the derivative of the product of two functions -- the first function times the derivative of the second, plus the second function times the derivative of the first.
The product rule is related to the quotient rule, which gives the derivative of the quotient of two functions, and the chain rule, which gives the derivative of the composite of two functions.
Example:
Find the derivative of f(x) = (3x + 5)(2x2 - 3) How to use the Product Rule for Derivatives?
Examples:
Find the derivative of
1. h(x) = (x2)(x3 + 4)
2. (sin x)(cos x)(x2 + 1)


 
Examples using the Product Rule and Chain Rule
Find the derivative of
1. f(x) = (5x5 - x7)(20x2 + 3x-7)
2. f(x) = (10x3 + 5x2 - 7)(20x8 - 7)
3. y = (x2 + 2x)5(3x-3 + x2)-7 How to find derivatives using the Product Rule, Chain Rule, and Factoring?
Example:
Find the derivative of
f(x) = x4(5x - 1)3

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