# Thread: How to write this in math shorthand

1. ## How to write this in math shorthand

Dear teachers,

Please help me write the following text in math:

X subscript n equals X subscript zero times 2 to the minus n over 12 power

Thank you very much.

2. ## Re: How to write this in math shorthand

Originally Posted by chiphu
Dear teachers,

Please help me write the following text in math:

X subscript n equals X subscript zero times 2 to the minus n over 12 power

Thank you very much.
x0 = xn * 2^(-n/12)

This editor apparently doesn't do subscripts or superscripts. You'll have to imagine the first 0 and n subscripted (moved down). The ^ means "to the power of" in plain text, but you can delete it and superscript everything following it .

3. ## Re: How to write this in math shorthand

Originally Posted by Raymott
x0 = xn * 2^(-n/12)

This editor apparently doesn't do subscripts or superscripts. You'll have to imagine the first 0 and n subscripted (moved down). The ^ means "to the power of" in plain text, but you can delete it and superscript everything following it .
Thanks a lot, sir. I got it.

By the way, here comes another one: X sub n equals a times 2 to the minus n over 12 power plus b

Based on your help, I wrote it on MS Word and does it display as correctly as this?

4. ## Re: How to write this in math shorthand

I don't think that is what you want: the "=a" part should not be subscript. Also, use "×" not "*". Only use "*" when you can't use "×" or ".".

So: a.2 or a×2 or even 2a, but try to avoid 2*a.

EDIT:

Actually, without parentheses (these things), we can't be sure exactly how to write your statement but I interpreted it in the same way Raymott did.

5. ## Re: How to write this in math shorthand

Originally Posted by Munch
I don't think that is what you want: the "=a" part should not be subscript.
Ah, no, it's not what I want and you're right, I took it wrong. As a matter of fact, it tells us to customize the first equation (at post#1) by replacing X subscript zero with a and add b at the end. So, the correct modified equation should be:

Originally Posted by Munch
Also, use "×" not "*". Only use "*" when you can't use "×" or ".".

So: a.2 or a×2 or even 2a, but try to avoid 2*a.
Thank you for your tip. I corrected it.

Originally Posted by Munch
EDIT:

Actually, without parentheses (these things), we can't be sure exactly how to write your statement but I interpreted it in the same way Raymott did.
Yes, I'm confused about this, too. According to the given fact (X sub n equals a times 2 to the minus n over 12 power plus b), I don't know if it's compulsory to put parentheses around a x 2^(-n/12). If so then we got: X0 = (a x 2^(-n/12)) + b

I'm totally relying on your comprehension and knowledge. Please!

6. ## Re: How to write this in math shorthand

Originally Posted by chiphu
Yes, I'm confused about this, too. According to the given fact (X sub n equals a times 2 to the minus n over 12 power plus b), I don't know if it's compulsory to put parentheses around a x 2^(-n/12). If so then we got: X0 = (a x 2^(-n/12)) + b

I'm totally relying on your comprehension and knowledge. Please!
I only used parentheses because I had to write it without markups.
X0 = (a x 2^(-n/12)) + b
Firstly, the outer parentheses are unnecessary because the b is added last in any case.
X0 = a x 2^(-n/12) + b
But you do need these, because 2^(-n/12) + b is not 2^(-n/12 + b)
and 2^-n/12 + b is ambiguous.
This is something that would be best discussed with your teacher.

7. ## Re: How to write this in math shorthand

Originally Posted by Tdol
x0 = xn * 2(-n/12)
That's what I tried first, but it doesn't display for me - I just see all the tags. Does it work for you?

EDIT: I guess Tdol deleted his/her post and is trying again.

8. ## Re: How to write this in math shorthand

Originally Posted by Raymott
x0 = xn * 2^(-n/12)

This editor apparently doesn't do subscripts or superscripts. You'll have to imagine the first 0 and n subscripted (moved down). The ^ means "to the power of" in plain text, but you can delete it and superscript everything following it .
I'll see if we can get the superscript/subscript tags added.

9. ## Re: How to write this in math shorthand

Originally Posted by Munch
That's what I tried first, but it doesn't display for me - I just see all the tags. Does it work for you?

EDIT: I guess Tdol deleted his/her post and is trying again.
No; I was testing. They need to be added; once added they should work fine.

10. ## Re: How to write this in math shorthand

This is a test of Superscript and Subscript text.

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