Question

Derivative question help.

Answer 1

@cwrw238

Answer 2

I don't actually understand what [d] and [b] are supposed to be?

Answer 3

can you take the first derivative?

Answer 4

Umm 4([d]x+[b])^3 * ([d]) ?

Answer 5

And then we derivate it again?

Answer 6

yes

Answer 7

Is there any way to solve this on some calculator?

Answer 8

yes thats the first derivative assuming [d] and [b] are constants

Answer 9

not that i know of

Answer 10

wolfram something?

Answer 11

you really need to learn to do it by hand to learn the rules of differentiation

Answer 12

yes

Answer 13

Please help me with this too

Answer 14

you perform the second derivative in a similar way to the first - use the chain rule

Answer 15

you need to take the second derivative for the first question. you only took the first derivative.

Answer 16

@surry99 thanks I'll solve that.
Please help me with the second one

Answer 17

@cwrw238 which question are you referring to?

Answer 18

the first one

Answer 19

thanks i got that. pleasae see the other one now

Answer 20

WAIT ARE D AND B GREATEST INTEGER FUNCTIONS???

Answer 21

idk this is what it says

Answer 22

lets for the sake of sake change the question

Answer 23

\[7x-4/3x+6\]

Answer 24

where a=7 b=4 c=3 d=6

Answer 25

from where did you get these values?

Answer 26

they can be any values........it doesnt matter

Answer 27

wait. no we cant change them

Answer 28

okay fine we go ur way

Answer 29

thanks

Answer 30

where are u stuck xactly??

Answer 31

Wait. now i get you. thanks, @cambrige

Answer 32

Can you help me with more

Answer 33

hit me

Answer 34

hahah. even if its hard?

Answer 35

no problem........m dat good

Answer 36

lmao

Answer 37

lmao

Answer 38

we use chain rule in q1 or something like that?

Answer 39

i think something like
dx/dy = dx/dt * dt/dy
?

Answer 40

ya

Answer 41

u neednt explain just hit me

Answer 42

but where it says that?
because it asks for magnitude and direction

Answer 43

?

Answer 44

sry

Answer 45

lag m back

Answer 46

ya so u diffrntiate it with respect to t

Answer 47

whats the problem??

Answer 48

wait ur therE??

Answer 49

so yeah first diffrntiate the individual functions wrt t

Answer 50

wait...........are x and y the distances covered??

Answer 51

if yes then u neednt differentiate

Answer 52

its asking velocity.okay then

Answer 53

find dx/dt find dy/dt at t=3

Answer 54

then use pythagoras theorem to find the net velocity!!

Answer 55

11 comments from me..where u at??

Answer 56

Sorry, I'm back.

Answer 57

how to find the direction again?

Answer 58

okay

Answer 59

what did u get after u differentiate??

Answer 60

Dirn depends upon the sign of the final answer

Answer 61

I didn't do it yet. :P

Answer 62

Lets say we get -2 as our answer. then what do we do?

Answer 63

u do it u get it.....easy peesy Japaneesy.........n

Answer 64

Noooo. the direction

Answer 65

lol.........differentiate it and temme the ans

Answer 66

Nooooo.

Answer 67

U gotta do it...only then will I xplain

Answer 68

dx/dt and dy/dt

Answer 69

okay..:c

Answer 70

Can you give me ten minutes? i will brb.
will you be here

Answer 71

mostly no.......but

Answer 72

lets see

Answer 73

Listen

Answer 74

@cambrige

Answer 75

OMG! Thank God you're here.

Answer 76

yes??

Answer 77

thats not 10 mins u know!!

Answer 78

I'm sorry. Forgive me.

Answer 79

So this one says to give answer to two decimal places?
http://assets.openstudy.com/updates/attachments/54a2db94e4b054f0c3b45c14-jessyjessy-1419959931449-capture.png

Answer 80

yes simple round off

Answer 81

whats the problem in that??

Answer 82

HOW?

Answer 83

Should we suppose values for [a], [b], etc?

Answer 84

no no

Answer 85

UNLESS ASKED

Answer 86

Then how to answer to two decimal places?

Answer 87

first differentiate it girl

Answer 88

temme what u get

Answer 89

I did.

Answer 90

wait

Answer 91

again.......temme what u got

Answer 92

argh....okay

Answer 93

lol

Answer 94

https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xpa1/v/t34.0-12/10904855_10204563993334072_1207931837_n.jpg?oh=f2ee4ac5d5444183ed252f9040066f58&oe=54A5D4BC&__gda__=1420132433_06148f42895fdd62d462353a64608cab