Question

derivatives

Answer 1

Find the derivative of f(x) = 5x + 9 at x = 2.

Answer 2

Your derivative function is pretty simple. You do f'(x) = d/dx(5x + 9)

Answer 3

The addition rule says that this is equal to f'(x) = d/dx(5x) + d/dx(9)

Answer 4

Taking the derivative of cx is always equal to c, where c is a constant.

Answer 5

For example the derivative of 10x is 10, the derivative of 1502x is 1502. The derivative of 5x is 5.

Answer 6

So your equation should now be f'(x) = 5 + d/dx(9)

Answer 7

Always remember that the derivative of a constant is always equal to 0. The derivative of 1 is 0, the derivative of 40 is 0. The derivative of 9 is 0

Answer 8

So in the end, your equation will be f'(x) = 5

Answer 9

I'm betting that since it is such a simple function she has to use the definition of a derivative

Answer 10

Oh actually ya my bad

Answer 11

.-. im so lost ive input x into the equation to 5(2)+9 =19 but 19 isnt an answer and so if im finding the derivative and derivative is the number that comes before x... and im pretty sure that guy is mocking me.... so the answer would be 5?

Answer 12

the answer is 5. But I might've shown you the wrong way

Answer 13

Ok did your class teach you about limits?

Answer 14

No, im learning this stuff online by myself and half the stuff the book goes over is in mathematic scholars words and then the other half they just skip over :p

Answer 15

Ok you need to first learn limits. Then you can learn about derivatives

Answer 16

In my calculus book, we first learn about limits. Then we can use limits to find derivatives.

Answer 17

And then you'll learn cool ways to find derivatives

Answer 18

.-. math is not cool.... nomatter what you do with it.....

Answer 19

But the first step in learning calculus is learning about limits. It's almost impossible to learn calculus by not learning it in the correct order.

Answer 20

Hey, I have a really good idea.

Answer 21

There is a youtube channel, called "Professor Leonard". This is a profressor who teaches basic calculus at his university. He recorded his videos.

Answer 22

If you want to learn calculus, he has videos on the course Calculus AB. He's a really good teacher

Answer 23

But i'll have to warn you, it'll be hard to learn calculus without doing some problems. So you should try to find an online textbook, or perhaps buy your own textbook. You need to practice by doing some problems to really become fluent at it.

Answer 24

like i have an online book it just really sucks at teaching it because it doesnt describe it very well. will that youtube thing help with PRE calc cuz thats what im in