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vazorg [7]
3 years ago
15

Find the derivative of f(x) = 11x2 + 5x at x = 9.

Mathematics
2 answers:
AlekseyPX3 years ago
6 0

Answer: 203

Step-by-step explanation:

The given function : f(x) = 11x^2 + 5x

Now, we differentiate the given function with respect to x on the both sides , we get

 f'(x) = (2)11x + 5    [Since (x^n)'=nx^{n-1} ]

\Rightarrow\ f'(x)=22x+5

Substitute x = 9 , we get

\Rightarrow\  f'(9)=22(9)+5\\\\\Rightarrow\ f'(9)=198+5\\\\\Rightarrow\ f'(9)=203

Hence, the derivative of the given function at x= 9 is 203.

Yakvenalex [24]3 years ago
3 0
F(x) = 11x² + 5x 

f'(x) = 22x + 5

Hence,

f'(9) = (22 * 9) + 5 = 198 + 5 = 203
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