Question

I need help, anyone?

Answer 1

Q. 2,3, 5?

Answer 2

do you have a graph yet? ... I can get you one !

Answer 3

yea its like this!

Answer 4

...

Answer 5

ohh i c :)

Answer 6

so for Q.2 we have to graph the inverse, right?

Answer 7

is this what is required at option a)?? ...I don't get it well enough (I'm not American/British :S )

Answer 8

two lines... f(x)=4x-8 and y=x

Answer 9

umm we have to find inverse first which is x+8/4=y and graphing it gives me

Answer 10

\[\Large f^{-1}(x) =\frac{1}{f(x)}\] ... so that should be .
.\[\LARGE f^{-1}(x)=\frac{1}{4x-8}\] is it??

Answer 11

and ur graph is answer to part 5

Answer 12

umm our teacher tell us that u switch letters first & then solve for y to get the inverse..

Answer 13

do u know how to do Q.3?

Answer 14

I know it like I wrote it !! O_O ... show me your way then!

Answer 15

are you there?

Answer 16

yea

Answer 17

i already told u inverse seems like x+8/4=y

Answer 18

or f^-1(x)

Answer 19

what does it mean to test the symmetry accross the line y=x?

Answer 20

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

Answer 21

lol okay..

Answer 22

y=f(x)=4x-8
x=4y-8 (switched)
x+8/4=y (solve for y)

Answer 23

still dizzy... I don't know.. OK now tell me if we have \[\LARGE f(x)=\frac{1-x}{1+x}\] how does f^{-1} go?

Answer 24

the inverse of f(x) is not 1/f(x)

Answer 25

ok I guess I'm wrong, but I want to learn it.. :(

Answer 26

To find the inverse, switch x and y, and write in terms of y.

Answer 27

well then @math456 is right !!...

Answer 28

f(x)=1-x/1+x
x=1-y/1+y
x(1+y)=1-y
x+xy=1-y
y=1-x+xy

Answer 29

y=1-x-xy*

Answer 30

????

Answer 31

y = (1 - x)/(1 + x)

Switching the x and y:

x = (1-y)/(1+y)

x + xy = 1 - y

y(1+x) = 1-x

y = (1-x)/(x+1)

Answer 32

with which number do you need help with?

Answer 33

Q.2 a,b

Answer 34

i mean like for a we hv to reflect the graph of f across the diagonal line y=x, how?

Answer 35

draw the y=x line and flip the line over it

Answer 36

I mean, flip it over the line

Answer 37

like this?

Answer 38

fliping it will be

Answer 39

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

Answer 40

Noo... you flip the function f(x) over the line y=x.

Answer 41

so for Q2a we hv to flip over the f(x) ?

Answer 42

or the inverse?

Answer 43

flip f(x) over y=x

Answer 44

ohh okay!

Answer 45

so its gona be like this?

Answer 46

how about 2b? and question 5 ask the same thing as 2a, right?

Answer 47

noooo