Question

Find slope of line tangent to f(x) = 11x^2 - 9x + 3 with x = 2.

Answer 1

get the its derivative, using the power rule, set "x" to 0 on the derivative

Answer 2

im confused mate

Answer 3

equation of slope of a line tangent = derivative of original equation

Answer 4

woops, I meant, set x = 2 rather

Answer 5

mate, my brain... ya on the right track

Answer 6

well, have you covered derivatives yet? do you know what a derivative is?

Answer 7

yeah its the rate of change mate

Answer 8

get the its derivative, using the power rule, set "x" to 2 on the derivative

Answer 9

will ya guide me through it mate? this review sheets confusin' me

Answer 10

well... haemm do you know the power rule?

Answer 11

not sure don't think so mate

Answer 12

hmmm are you supposed to use .... something ... to solve this?

Answer 13

other than the power rule that is

Answer 14

nah its justa made up review by the teacher. i dont get it . no guidance

Answer 15

hmmm review = re view = to view again = re visit

meaning it has been covered already it seems

Answer 16

mate i need help. will ya help guide me?

Answer 17

well.... not sure .... what to use =).. .the limit definition of a derivative... which you likely dunno or the power rule which you dunno either... so

dunno what applies to your term

Answer 18

Are you suppose to use the definition of derivative, you know the one that involves the word limit?

Answer 19

implicits

Answer 20

What do you mean by implicit?

Have you ever seen the following rule:
\[\frac{d}{dx} x^n=nx^{n-1} \]

Answer 21

nah mate

Answer 22

you can always check getting it by using its limit defintion -> http://www.youtube.com/watch?v=WERgBgi4hg4

Answer 23

confusion hurts mate

Answer 24

if you haven't covered the material, it'd not be proper to try do the exercise

Answer 25

it'd be nice if i cold see that aanwr worked out so i can study fromit

Answer 26

If you don't know power rule then you will have to use the definition of derivative:
\[\frac{d}{dx} f(x)=\lim_{h \rightarrow 0}\frac{f(x+h)-f(x)}{h}\]

Answer 27

Have you see this above definition?

Answer 28

that video covers it that, it has an example worked out

Answer 29

it should give mea somethin/somethin answer

Answer 30

bagajr my hero

Answer 31

so its only 35?

Answer 32

Its only 35? thats it?

Answer 33

Yes, a slope is a number.

Answer 34

Oh so its not 35 by something? I never knew

Answer 35

Please don't just give the answer next time. I really have one learn it and then try their assignment. This student doesn't even know the most basic definition of a derivative. It doesn't take a lot of effort to have seen the definition before. I feel there has not been a lot of effort here honestly.

Answer 36

myiniaya i am just stumped

Answer 37

@myininaya Yeah but I don't think ripping the answers away from him and shoving equations and comments that he doesn't understand helps either. You can't force them to learn, you have to make them want to.

Answer 38

thanks ill study it bagajr thanks

Answer 39

It is against the rules to use the site for cheating.

Answer 40

ya but its justa review sheet its not fora grade mate

Answer 41

@jeffsours Ask me if you have any specific questions about this. But do you understand what I did up there? When you take a derivative of x^n, just multiply by n (the power) and subtract 1 from the power.\[\Large x^n \rightarrow nx^{n-1}\]\[\Large x^3 \rightarrow 3x^2\]\[\Large x^2 \rightarrow 2x^1=2x\]\[\Large11x^2 \rightarrow 22x^1=22x\]\[\Large9x \rightarrow 9x^0=9*1=9\]Also, derivative of any constant is 0 because derivative is how much something changes and constans don't change so\[\Large3 \rightarrow 0\]\[\Large1 \rightarrow 0\]\[\Large \pi \rightarrow 0\]If you don't understand all of this, please ask because this is the bare basics and you really ned to know it.

Answer 42

With that, I think i undestand it better. im gonna print your response out as notes

Answer 43

okay good