What did you learn today??....add yours to the list!

  • Christian Chat is a moderated online Christian community allowing Christians around the world to fellowship with each other in real time chat via webcam, voice, and text, with the Christian Chat app. You can also start or participate in a Bible-based discussion here in the Christian Chat Forums, where members can also share with each other their own videos, pictures, or favorite Christian music.

    If you are a Christian and need encouragement and fellowship, we're here for you! If you are not a Christian but interested in knowing more about Jesus our Lord, you're also welcome! Want to know what the Bible says, and how you can apply it to your life? Join us!

    To make new Christian friends now around the world, click here to join Christian Chat.
zeroturbulence said:
Its that little number in the upper corner that means "to the power of". For example, an exponent of 2 means "squared".. 2x2. :rolleyes: I'm sure u already knew this. ;)
Click to expand...
Yeah, but they weren't numbers. They were letters. Thus my confusion. :rolleyes:

(I vaguely remember A, B, C, X, Y, Z, but I've never gone as far as to see M or N.)

I'd rather go back to relearn (because I can never remember the rules) gerunds and participle phrases.
 
Depleted said:
Yeah, but they weren't numbers. They were letters. Thus my confusion. :rolleyes:

(I vaguely remember A, B, C, X, Y, Z, but I've never gone as far as to see M or N.)

I'd rather go back to relearn (because I can never remember the rules) gerunds and participle phrases.
Click to expand...
The letters just represent numbers in a formula/equation. It's algebra.

Like if I say A+B=C, and A is 1, and B is 2, what is C? The answer is C=3.... 1+2=3.

Then I could say what if A is 4? Then 4+2=6, so in that case C=6..
 
Here is the problem... I will forever be indebted to anyone who can help me, since nobody else seems to be able to. I'm sure it's probably fairly simple and I am going to kick myself later for not being able to figure it out on my own.

Find the cubic equation that has -1 and 2i as roots.

A. y = X^3 - X^2 + 4x - 4
B. y = X^3 + X^2 - 4x - 4
C. y = X^3 + X^2 + 4x + 1
D. y = X^3 + X^2 + 4x + 4
E. y = X^3 - X^2 + 4x - 1
 
EmilyNats said:
Here is the problem... I will forever be indebted to anyone who can help me, since nobody else seems to be able to. I'm sure it's probably fairly simple and I am going to kick myself later for not being able to figure it out on my own.

Find the cubic equation that has -1 and 2i as roots.

A. y = X^3 - X^2 + 4x - 4
B. y = X^3 + X^2 - 4x - 4
C. y = X^3 + X^2 + 4x + 1
D. y = X^3 + X^2 + 4x + 4
E. y = X^3 - X^2 + 4x - 1
Click to expand...

I get the answer of "A" and "D". Here's how I worked through it, and I hope it is right (and that someone with more math-fu can correct me if I am in error):

If 2i is a root, then so is -2i. Similarly, if -1 is a root, then 1 is too. So I take those two roots of 2i and multiply the binomials:

(x+2i)*(x-2i) -> x^2-2ix+2ix-4i (FOIL method) -> x^2+4 (because i=sqrt(-1) and a sqrt*sqrt undoes the root)

Now take that polynomial (x^2+4) and multiply it by a binomial containing your other root (-1):

(x^2+4)*(x-1) -> x^3+4x-x^2-4 (FOIL method) -> x^3-x^2+4x-4 -> choice "A"

(x^2+4)*(x+1) ->x^3+4x+x^2+4 (FOIL method) -> x^3+x^2+4x+4 -> choice "D"
 
When a bug is reported in a program and you can't make it happen for you so you can fix it, you say "cannot reproduce" or "cannot replicate." Mom was certain it was something else, some synonym of replicate, but we never found out what she was trying to think of.

But in my google searching I learned the term heisenbug.

https://en.wikipedia.org/wiki/Heisenbug
 
Lynx said:
When a bug is reported in a program and you can't make it happen for you so you can fix it, you say "cannot reproduce" or "cannot replicate." Mom was certain it was something else, some synonym of replicate, but we never found out what she was trying to think of.

But in my google searching I learned the term heisenbug.

https://en.wikipedia.org/wiki/Heisenbug
Click to expand...

I have a strong feeling the real reason they chose that name is because of Breaking Bad.. :rolleyes:

esq-heisenberg-xlg.jpg
 
Yahweh_is_gracious said:
I get the answer of "A" and "D". Here's how I worked through it, and I hope it is right (and that someone with more math-fu can correct me if I am in error):

If 2i is a root, then so is -2i. Similarly, if -1 is a root, then 1 is too. So I take those two roots of 2i and multiply the binomials:

(x+2i)*(x-2i) -> x^2-2ix+2ix-4i (FOIL method) -> x^2+4 (because i=sqrt(-1) and a sqrt*sqrt undoes the root)

Now take that polynomial (x^2+4) and multiply it by a binomial containing your other root (-1):

(x^2+4)*(x-1) -> x^3+4x-x^2-4 (FOIL method) -> x^3-x^2+4x-4 -> choice "A"

(x^2+4)*(x+1) ->x^3+4x+x^2+4 (FOIL method) -> x^3+x^2+4x+4 -> choice "D"
Click to expand...

I can only pick one choice, but that does open some things up for me. I knew I was supposed to be multiplying something, and have no idea why I didn't think to use conjugates. Going to have to do a little more thinking on a few "why" things,but thanks for shedding some light on this!
 
So after several hours of googling and straining my brain to no avail, a grand revelation suddenly came to me. I was right, it was a simple solution hidden amongst a seemingly complicated problem. All I had to do was substitute -1 and 2i out for x and see which equation satisfied both roots.
 
Today I learned that it is way too easy to get another credit card. Well okay, I think I already knew that, but I'm not sure whether to enjoy the practical experience of it or to be a bit disconcerted by it. Now I have the ability to build up lots more debt (theoretically, though I'm sure my other CC company would have been happy to raise my limit if I'd asked or just gotten close to it).
 
Today I learned that, when you have a song stuck in your head, you're supposed to sing "Amazing Grace" to the tune of Gilligans Island. Now I have this stuck in my head:o:

[video=youtube;Qq61SPB3XDw]https://www.youtube.com/watch?v=Qq61SPB3XDw[/video]
 
The Thirty-Nine Steps by John Buchan is really not very much like the Hitchcock film.
 
I learned that I dont really have friends or family except 2 people. You know when the storm comes and they are tested.
 
cinder said:
Today I learned that it is way too easy to get another credit card. Well okay, I think I already knew that, but I'm not sure whether to enjoy the practical experience of it or to be a bit disconcerted by it. Now I have the ability to build up lots more debt (theoretically, though I'm sure my other CC company would have been happy to raise my limit if I'd asked or just gotten close to it).
Click to expand...

.
They are easy to get for a reason. I cant get approved for a carwash card but I can get a credit card in minutes.
 
Lynx said:
When a bug is reported in a program and you can't make it happen for you so you can fix it, you say "cannot reproduce" or "cannot replicate." Mom was certain it was something else, some synonym of replicate, but we never found out what she was trying to think of.

But in my google searching I learned the term heisenbug.

https://en.wikipedia.org/wiki/Heisenbug
Click to expand...

.
I never heard that. Most people I know just say "cannot find the bug". =D
programming sucks! ( in C#)
not as much as math
 
Last edited:
Wal-Mart sells escargot. They come in a cylindrical plastic tube. I didn't buy any, I ain't that swanky. I was buying tuna fish- but the solid white albacore, so a little swanky.
 
You must log in or register to reply here.
Top Bottom
Back