help quick!!

E

erincalc

New member
Joined
Jan 9, 2006
Messages
1
it's a multiple choice question:
The function y=ln x+2 has a y-intercept at y=?
a)0
b)1
c)2
d)e
e)there is no y-intercept[/i]
 
erincalc said:
it's a multiple choice question:
The function y=ln x+2 has a y-intercept at y=?
a)0
b)1
c)2
d)e
e)there is no y-intercept[/i]
Click to expand...


Y-intercept >>>>> when x=0

y=ln(0)+2


What is ln(0)?
 
...or, if y = ln(x+2), what is ln(0+2)?

Feel free to write more clearly. Parentheses usually help.
 
Daniel Feldman,
While you are correct about looking at the options to determine the meaning ln x+2, my question is why should we have to?

Why don’t we insist that posters correctly use function notation.
After all, isn’t part of our mission the teaching of proper notation?

Why do we accept ln x and not insist upon ln(x)?
Why do we accept sin x and not insist upon sin(x)?
Again, after all, each of these is a function!
 
pka said:
Daniel Feldman,
While you are correct about looking at the options to determine the meaning ln x+2, my question is why should we have to?

Why don’t we insist that posters correctly use function notation.
After all, isn’t part of our mission the teaching of proper notation?

Why do we accept ln x and not insist upon ln(x)?
Why do we accept sin x and not insist upon sin(x)?
Again, after all, each of these is a function!
Click to expand...

Unfortunately, for them, it's just "another course", and not their passion, as it is for us. Fret not, the "Golden Age of Mathematics" will come again.
 
But we could say that we will not answer until you tell us is it
ln(x+2) or ln(x)+2?
 
pka said:
But we could say that we will not answer until you tell us is it
ln(x+2) or ln(x)+2?
Click to expand...


Ok, ok....sorry.


It might have to do with my being in high school and always getting annoyed when teachers are complete curmudgeons about notation. Yes, I know it's crucial nonetheless.
 
Daniel_Feldman said:
ln(2) is not a choice, so we can forgive it. Or not
Click to expand...
Granted. However, if it came home on a worksheet or exam like that, I'd argue it with the teacher. Printed materials do have errors from time to time. This would be particularly important if "None of the Above" was listed as a choice. It would be the guess-what-was-in-the-teacher's-mind game. Very bad.
 
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