math456
I need help, anyone?



This Question is Closed

math456
Best Response
You've already chosen the best response.
0
Q. 2,3, 5?

Kreshnik
Best Response
You've already chosen the best response.
0
do you have a graph yet? ... I can get you one !

math456
Best Response
You've already chosen the best response.
0
dw:1333410736966:dw yea its like this!

Kreshnik
Best Response
You've already chosen the best response.
0
...

math456
Best Response
You've already chosen the best response.
0
ohh i c :)

math456
Best Response
You've already chosen the best response.
0
so for Q.2 we have to graph the inverse, right?

Kreshnik
Best Response
You've already chosen the best response.
0
is this what is required at option a)?? ...I don't get it well enough (I'm not American/British :S )

Kreshnik
Best Response
You've already chosen the best response.
0
two lines... f(x)=4x8 and y=x

math456
Best Response
You've already chosen the best response.
0
umm we have to find inverse first which is x+8/4=y and graphing it gives me dw:1333411085687:dw

Kreshnik
Best Response
You've already chosen the best response.
0
\[\Large f^{1}(x) =\frac{1}{f(x)}\] ... so that should be .
.\[\LARGE f^{1}(x)=\frac{1}{4x8}\] is it??

math456
Best Response
You've already chosen the best response.
0
and ur graph is answer to part 5

math456
Best Response
You've already chosen the best response.
0
umm our teacher tell us that u switch letters first & then solve for y to get the inverse..

math456
Best Response
You've already chosen the best response.
0
do u know how to do Q.3?

Kreshnik
Best Response
You've already chosen the best response.
0
I know it like I wrote it !! O_O ... show me your way then!

Kreshnik
Best Response
You've already chosen the best response.
0
are you there?

math456
Best Response
You've already chosen the best response.
0
yea

math456
Best Response
You've already chosen the best response.
0
i already told u inverse seems like x+8/4=y

math456
Best Response
You've already chosen the best response.
0
or f^1(x)

math456
Best Response
You've already chosen the best response.
0
what does it mean to test the symmetry accross the line y=x?

Kreshnik
Best Response
You've already chosen the best response.
0
I don't know it either... but tell me, how do you get x+8/4=y ... show me steps I want to see them if it's possible ! O_O

math456
Best Response
You've already chosen the best response.
0
lol okay..

math456
Best Response
You've already chosen the best response.
0
y=f(x)=4x8
x=4y8 (switched)
x+8/4=y (solve for y)

Kreshnik
Best Response
You've already chosen the best response.
0
still dizzy... I don't know.. OK now tell me if we have \[\LARGE f(x)=\frac{1x}{1+x}\] how does f^{1} go?

slaaibak
Best Response
You've already chosen the best response.
1
the inverse of f(x) is not 1/f(x)

Kreshnik
Best Response
You've already chosen the best response.
0
ok I guess I'm wrong, but I want to learn it.. :(

slaaibak
Best Response
You've already chosen the best response.
1
To find the inverse, switch x and y, and write in terms of y.

Kreshnik
Best Response
You've already chosen the best response.
0
well then @math456 is right !!...

math456
Best Response
You've already chosen the best response.
0
f(x)=1x/1+x
x=1y/1+y
x(1+y)=1y
x+xy=1y
y=1x+xy

math456
Best Response
You've already chosen the best response.
0
y=1xxy*

math456
Best Response
You've already chosen the best response.
0
????

slaaibak
Best Response
You've already chosen the best response.
1
y = (1  x)/(1 + x)
Switching the x and y:
x = (1y)/(1+y)
x + xy = 1  y
y(1+x) = 1x
y = (1x)/(x+1)

slaaibak
Best Response
You've already chosen the best response.
1
with which number do you need help with?

math456
Best Response
You've already chosen the best response.
0
Q.2 a,b

math456
Best Response
You've already chosen the best response.
0
i mean like for a we hv to reflect the graph of f across the diagonal line y=x, how?

slaaibak
Best Response
You've already chosen the best response.
1
draw the y=x line and flip the line over it

slaaibak
Best Response
You've already chosen the best response.
1
I mean, flip it over the line

math456
Best Response
You've already chosen the best response.
0
dw:1333412317919:dw like this?

math456
Best Response
You've already chosen the best response.
0
fliping it will bedw:1333412361021:dw

slaaibak
Best Response
You've already chosen the best response.
1
That's y=x yes.
Best way to see it is to draw the line, then folding the paper over y=x and to see how the graph reflects

slaaibak
Best Response
You've already chosen the best response.
1
Noo... you flip the function f(x) over the line y=x.

math456
Best Response
You've already chosen the best response.
0
so for Q2a we hv to flip over the f(x) ?

math456
Best Response
You've already chosen the best response.
0
or the inverse?

slaaibak
Best Response
You've already chosen the best response.
1
flip f(x) over y=x

math456
Best Response
You've already chosen the best response.
0
ohh okay!

math456
Best Response
You've already chosen the best response.
0
dw:1333412477378:dw so its gona be like this?

math456
Best Response
You've already chosen the best response.
0
how about 2b? and question 5 ask the same thing as 2a, right?

slaaibak
Best Response
You've already chosen the best response.
1
noooo
dw:1333412696801:dw

slaaibak
Best Response
You've already chosen the best response.
1
question 2 b: get a few points (x,y)
then change them to (y,x) and draw them

math456
Best Response
You've already chosen the best response.
0
and 5 is dw:1333412939248:dw ?

slaaibak
Best Response
You've already chosen the best response.
1
Not exactly sure what they mean..

math456
Best Response
You've already chosen the best response.
0
so for 2b i got a graph like this dw:1333413313588:dw

slaaibak
Best Response
You've already chosen the best response.
1
... I honestly don't know how you got that. Look at my graph. Thats how f, y=x and f^1 looks like

math456
Best Response
You've already chosen the best response.
0
that was for f(x) and if I reflect it, i'll get dw:1333413484096:dw

math456
Best Response
You've already chosen the best response.
0
with Question 5?