1 Answer

Jerric Lyns John · Answer 1 · 2017-03-08T02:48:46+0000

The derivative of f(x) = 5x + 9 is f'(x) = 5.

This is, it is a constant: it does not depends on x.

Then, the derivative at x = 2 (and at any value of x) is 5.

Answer: 5

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