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Reflection in y-axis


sysD

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okay, so that was something i could have figured out if i wasn't dead tired =p

i've got it now.

 

but here's something.

 

y=-2log_3(x-3)-1

 

I've graphed this out and there seems to be an asymptote at x=3. Intuitively, I can say that x cannot be less than 3.

HOWEVER.

 

When I graph with a calculator, it shows values at x=2 and below.

How can this be? (eg coordinates= (2, -1), (0, -3)

Edited by sysD
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oh, im sorry. i was working on another problem and i must have mixed up the two pages. the wolfram page you posted is the correct one...

 

and yeah, haha, i know it is a bit of a jump. but i realized the answer to my op and instead of creating a new thread for another question, i just decided to put it here instead.

 

[math] y = -2log_3(x-3) -1 [/math]

 

(thanks, cap'n)

 

so how can x be less than three? in other words, i know the vertical asymptote isn't crossed, but how can there be a log(-1)?

Edited by sysD
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sorry bout that, now that i know how to use latex it'll be easier to express equations from now on

 

any ideas on how to get values from log(-1)?

that seems to me to be an invalid domain. yet wolfram yields results

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an asymptote is a value that cannot exist and other values approach that limit, right?

 

sure, i get that, but lets forget about the asymptote itself.

 

how can this:

 

[math] y=log(-x) [/math]

 

be valid?

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$20 used :|

 

College Algebra is also something you will find in, at the very least, the downtown public library. You learn so much more from books and the internet just hacks your brain to little pieces.

 

It's really just what I've always done, before I started buying books I got them from the library, sorry if I offended you.

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