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progressoid

(49,991 posts) Mon Dec 22, 2014, 02:25 PM Dec 2014

Solving for X...

9 replies

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Solving for X... (Original Post) progressoid Dec 2014 OP

Ha! shenmue Dec 2014 #1

Cute... cyberswede Dec 2014 #2

e=exponent? GeorgeGist Dec 2014 #3

e is the base of the ln (the 'natural' logarithm) pokerfan Dec 2014 #4

Perfect - thank you! cyberswede Dec 2014 #5

When my oldest turned 15, helping with homework was more her helping me, than me helping her. progressoid Dec 2014 #7

Euler's number, one of the most important constants in math Recursion Dec 2014 #8

It's the opposite of the ln() operation Recursion Dec 2014 #9

Math is fun! Wounded Bear Dec 2014 #6

shenmue

(38,506 posts)

1. Ha!

Reply to progressoid (Original post)

Mon Dec 22, 2014, 03:53 PM

Dec 2014

cyberswede

(26,117 posts)

2. Cute...

Reply to progressoid (Original post)

Mon Dec 22, 2014, 04:29 PM

Dec 2014

but where did the "e" in the third line come from?

I want to show this to my kids, but I want to make sure I understand it first.

GeorgeGist

(25,321 posts)

3. e=exponent?

Reply to cyberswede (Reply #2)

Mon Dec 22, 2014, 05:10 PM

Dec 2014

pokerfan

(27,677 posts)

4. e is the base of the ln (the 'natural' logarithm)

Reply to GeorgeGist (Reply #3)

Mon Dec 22, 2014, 05:20 PM

Dec 2014

like 10 is the base of the log or common logarithm.

http://en.wikipedia.org/wiki/E_(mathematical_constant)

cyberswede

(26,117 posts)

5. Perfect - thank you!

Reply to pokerfan (Reply #4)

Mon Dec 22, 2014, 05:23 PM

Dec 2014

It's almost to the point where I can't help my 14 year old with his math homework any more...

progressoid

(49,991 posts)

7. When my oldest turned 15, helping with homework was more her helping me, than me helping her.

Reply to cyberswede (Reply #5)

Mon Dec 22, 2014, 11:32 PM

Dec 2014

And the second daughter just flew by me.

Recursion

(56,582 posts)

8. Euler's number, one of the most important constants in math

Reply to GeorgeGist (Reply #3)

Tue Dec 23, 2014, 12:52 AM

Dec 2014

? gets all the glory, but e does all the real work.

Recursion

(56,582 posts)

9. It's the opposite of the ln() operation

Reply to cyberswede (Reply #2)

Tue Dec 23, 2014, 12:54 AM

Dec 2014

If you have y = ln(x) then you can also say e^y = x.

Wounded Bear

(58,662 posts)

6. Math is fun!

Reply to progressoid (Original post)

Mon Dec 22, 2014, 10:09 PM

Dec 2014

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