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manlycool9962
20.09.2020 •
Mathematics
Find f '(x) and f ''(x).
f(x) = (x3 + 1)ex
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Ответ:
and![f''(x) = e^{x}(x^{3}+6x^{2} + 6x + 1)](/tpl/images/0771/4703/f3b5b.png)
Step-by-step explanation:
From the question,
f(x) = (x3 + 1)ex
That is,
Then , we can write that
To find f'(x), we will differentiate
and then add it to the differential of ![e^{x}](/tpl/images/0771/4703/8110c.png)
First, we will differentiate
,
Let
(This is a product)
Then,
Hence,
Given
, Using the product rule
Hence,
and
∴![f'(x) = x^{3}e^{x} + 3x^{2}e^{x} + e^{x}](/tpl/images/0771/4703/f7b60.png)
For f ''(x)
To find f ''(x), will differentiate f '(x)
This is also a product, then we will apply the product rule
From the product rule,
Given
, Using the product rule
Here, Let
and ![v(x) = x^{3} + 3x^{2} + 1](/tpl/images/0771/4703/954de.png)
Then,
∴![f''(x) = e^{x}(x^{3}+6x^{2} + 6x + 1)](/tpl/images/0771/4703/f3b5b.png)
Hence,
and![f''(x) = e^{x}(x^{3}+6x^{2} + 6x + 1)](/tpl/images/0771/4703/f3b5b.png)
Ответ: