Question

Can I get help with this Cal 1 prob

Answer 1

where is it?

Answer 2

number 3

Answer 3

This is unfeigned cheating...

Answer 4

how so

Answer 5

I am not blind, I can see that you are taking an online test.

Answer 6

agree...

Answer 7

this is a quiz not a test we take tests in person

Answer 8

and we are allowed to get help on quizes as well as hw

Answer 9

:) what have you tried so far? maybe i can help iron it out

Answer 10

q3 looks greened out, which one of these are you actually needing help with?

Answer 11

I got the points of inflection but it said it was wrong on the last one i did it asks similar questions that generally have close to the same answer

Answer 12

3

Answer 13

that my first choice just not sure if it is correct would like someone to verify

Answer 14

i like working with product rule better that quotient rule; makes the mathing simpler to me

Answer 15

^

Answer 16

\[f(x)=x(9x^2-16)^{-1}\]
\[f'(x)=x'(9x^2-16)^{-1}+x(9x^2-16)'^{-1}\]

Answer 17

we need the 2nd derivative for concavity and infections

Answer 18

\[f'(x)=x'(9x^2-16)^{-1}+x(9x^2-16)'^{-1}\]
\[f''(x)=x''(9x^2-16)^{-1}+x'(9x^2-16)'^{-1}+x'(9x^2-16)'^{-1}+x(9x^2-16)''^{-1}\]
\[f''(x)=x''(9x^2-16)^{-1}+2x'(9x^2-16)'^{-1}+x(9x^2-16)''^{-1}\]

Answer 19

can you sort that out?

Answer 20

yes

Answer 21

OK i think i got it

Answer 22

also i am completly confused on this one

Answer 23

should come out to this in the end

Answer 24

with that mess .... we find the zeros for top and bottom to test out

Answer 25

Yea thats what i got on that one

Answer 26

How do i do number 6 though completly confused.

Answer 27

you get to the second derivative :)

Answer 28

f(x) = cx^2 - 3x^-2

f'(x) = 2cx +6x^-3

f''(x) = 2c -18x^-4

Answer 29

why did i have to post to this question lol notification crazy going on right now

Answer 30

now when x = 4, this ideally should equal 0

Answer 31

ok

Answer 32

f''(4) = 0 = 2c - 18/4^4
18/4^4 = 2c
9/4^4 = c

Answer 33

4^4 = (2^2)^4 = 2^8 = 256 i believe

Answer 34

then wat do i do after that

Answer 35

you compare c = 9/256 with the answer options and see what matches ......

Answer 36

ok cool i can do that

Answer 37

lol

Answer 38

also do u know what they are asking for this question

Answer 39

im sure that i do

Answer 40

do you recall what a derivative (f') tells us about a function?

Answer 41

whether is conclaves down or not right

Answer 42

close, thats f'' the 2nd derivative

f' tells us the slope of the tangent line to any given point

Answer 43

so the graph of a derivative is negative when the slope at a point is negative; 0 when we reach a min or max or sometimes an inflection, and postive when the slope is increasing

Answer 44

oh ok see we havant really gone over how to get slopes from the graphs

Answer 45

how can i do that

Answer 46

im sure they give you options to choose from ....

Answer 47

oh im sorry i dint let u see the options let me reload it.

Answer 48

the slopes should map out something like this