anonymous
  • anonymous
logarithms anyone?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
bahrom7893
  • bahrom7893
i gotta revise those too, so what are the questions?
anonymous
  • anonymous
how do i get the inverse y=logsub3x
anonymous
  • anonymous
so its y=(little3at the bottom)x

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More answers

bahrom7893
  • bahrom7893
k
bahrom7893
  • bahrom7893
\[y=\log_{3}x \] \[3^{y}=x\] So x = y^3 is that what u mean by inverse?
anonymous
  • anonymous
the inverse of the function
anonymous
  • anonymous
i dont get that either
bahrom7893
  • bahrom7893
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
bahrom7893
  • bahrom7893
inverse function is: Say: y = f(x) then inverse is: x = F^-1 (y), which basically means solve for X
anonymous
  • anonymous
ok thank you soo much
bahrom7893
  • bahrom7893
hey can u check the answer key.. like gimme any problem with an answer to it
bahrom7893
  • bahrom7893
and ill make sure the answer's right
anonymous
  • anonymous
answer key? like in the back of the book?
anonymous
  • anonymous
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
bahrom7893
  • bahrom7893
just gimme any similar problems from the book that has an answer to it
bahrom7893
  • bahrom7893
like anything like y = log(sub5)x and then it has an answer.. numbers dont matter
anonymous
  • anonymous
ok, wait a sec
anonymous
  • anonymous
13. y=logsubX
anonymous
  • anonymous
answer: f^-19x0=7^x
anonymous
  • anonymous
*answer: f^-1(x)=7^x
bahrom7893
  • bahrom7893
u forgot to add what is under sub
anonymous
  • anonymous
sorry the second is the real answer
anonymous
  • anonymous
there is no under sub
bahrom7893
  • bahrom7893
Oh its just \[y = \log_{} x\]
bahrom7893
  • bahrom7893
?
anonymous
  • anonymous
ya, its: y=log(undersub7) X
anonymous
  • anonymous
answer:f^-1(x)=7^x
bahrom7893
  • bahrom7893
Okay that makes sense now
anonymous
  • anonymous
sorry if i confused you!
bahrom7893
  • bahrom7893
So my answer wasn't technically wrong but still it was in wrong notation
bahrom7893
  • bahrom7893
workin on the first one
anonymous
  • anonymous
oh alright
bahrom7893
  • bahrom7893
\[y=\log_{3}x ; x = 3^{y} ; f ^{-1} (x) = 3^{x}\]
anonymous
  • anonymous
i understood everything till the last setp
bahrom7893
  • bahrom7893
oh for you to make it into inverse, just replace y with x, say: Sin(x) = y; Sin^-1(y) = x
anonymous
  • anonymous
so would i have to put it as : \[\prime-1(x)=3^{x}\]
anonymous
  • anonymous
i meant f^-1(x)=3^x
bahrom7893
  • bahrom7893
yes
anonymous
  • anonymous
hmm, i was pretty sure you could have answered it differently. it cant be: y=3^x
bahrom7893
  • bahrom7893
http://www.sosmath.com/algebra/logs/log4/log45/log4513/log4513.html
anonymous
  • anonymous
oh thanks that seems helpful, can i ask 1 more and see if i get it?
bahrom7893
  • bahrom7893
yeah
anonymous
  • anonymous
f(x)=lnx
anonymous
  • anonymous
ok, i dont even know what to do here,
anonymous
  • anonymous
we basically solve for x, right?
bahrom7893
  • bahrom7893
yup and this is my favourite stuff! so useful in calculus
bahrom7893
  • bahrom7893
k so Lnx is the same as Log(sub e)X, where e is approximately 2.71
anonymous
  • anonymous
right
anonymous
  • anonymous
oh,. sorry, how can i add you as a fan?
anonymous
  • anonymous
oh, nvm, haha
bahrom7893
  • bahrom7893
sure lol
anonymous
  • anonymous
ok, so i get it so far
bahrom7893
  • bahrom7893
good and start a new topic. this is getting annoying, my browser keeps scrollin up and down. this place is buggy

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