Question

logarithms anyone?

Answer 1

i gotta revise those too, so what are the questions?

Answer 2

how do i get the inverse y=logsub3x

Answer 3

so its y=(little3at the bottom)x

Answer 4

k

Answer 5

\[y=\log_{3}x \]
\[3^{y}=x\]
So x = y^3 is that what u mean by inverse?

Answer 6

the inverse of the function

Answer 7

i dont get that either

Answer 8

http://www.andrews.edu/~calkins/math/webtexts/numb17.htm
sorry havent done logs in a long time, i only use Ln,s but that is the inverse function

Answer 9

inverse function is:
Say:
y = f(x)
then inverse is: x = F^-1 (y), which basically means solve for X

Answer 10

ok thank you soo much

Answer 11

hey can u check the answer key.. like gimme any problem with an answer to it

Answer 12

and ill make sure the answer's right

Answer 13

answer key? like in the back of the book?

Answer 14

ummm, this is a unit 4 test that was left for hw, so we cant look at the answers in the back of the book T_T

Answer 15

just gimme any similar problems from the book that has an answer to it

Answer 16

like anything like y = log(sub5)x and then it has an answer.. numbers dont matter

Answer 17

ok, wait a sec

Answer 18

13. y=logsubX

Answer 19

answer: f^-19x0=7^x

Answer 20

*answer: f^-1(x)=7^x

Answer 21

u forgot to add what is under sub

Answer 22

sorry the second is the real answer

Answer 23

there is no under sub

Answer 24

Oh its just \[y = \log_{} x\]

Answer 25

?

Answer 26

ya, its: y=log(undersub7) X

Answer 27

answer:f^-1(x)=7^x

Answer 28

Okay that makes sense now

Answer 29

sorry if i confused you!

Answer 30

So my answer wasn't technically wrong but still it was in wrong notation

Answer 31

workin on the first one

Answer 32

oh alright

Answer 33

\[y=\log_{3}x ; x = 3^{y} ; f ^{-1} (x) = 3^{x}\]

Answer 34

i understood everything till the last setp

Answer 35

oh for you to make it into inverse, just replace y with x, say:
Sin(x) = y; Sin^-1(y) = x

Answer 36

so would i have to put it as :
\[\prime-1(x)=3^{x}\]

Answer 37

i meant f^-1(x)=3^x

Answer 38

yes

Answer 39

hmm, i was pretty sure you could have answered it differently. it cant be:
y=3^x

Answer 40

http://www.sosmath.com/algebra/logs/log4/log45/log4513/log4513.html

Answer 41

oh thanks that seems helpful, can i ask 1 more and see if i get it?

Answer 42

yeah

Answer 43

f(x)=lnx

Answer 44

ok, i dont even know what to do here,

Answer 45

we basically solve for x, right?

Answer 46

yup and this is my favourite stuff!
so useful in calculus

Answer 47

k so Lnx is the same as Log(sub e)X, where e is approximately 2.71

Answer 48

right

Answer 49

oh,. sorry, how can i add you as a fan?

Answer 50

oh, nvm, haha

Answer 51

sure lol

Answer 52

ok, so i get it so far

Answer 53

good and start a new topic. this is getting annoying, my browser keeps scrollin up and down. this place is buggy