## Search found 5 matches

- Thu May 26, 2011 1:57 pm
- Forum: Discrete Mathematics
- Topic: Discrete Math Problem
- Replies:
**4** - Views:
**4800**

### Re: Discrete Math Problem

Yes, correct on both counts. I meant that to be an exponent, and I had copied and pasted it from elsewhere. Anyway, here's my solution: Factoring tells us that x 2 + 2 x + 1 = ( x + 1) 2 So, x is odd iff x + 1 is even iff ( x + 1) 2 is even. Would this be an acceptable proof? Thanks again!

- Thu May 26, 2011 3:49 am
- Forum: Discrete Mathematics
- Topic: Discrete Math Problem
- Replies:
**4** - Views:
**4800**

### Discrete Math Problem

Prove the following about integers:

*x*is an odd integer iff*x*2 + 2*x*+ 1 is an even integer.- Fri Feb 04, 2011 3:28 pm
- Forum: Number
- Topic: Simplifying
- Replies:
**6** - Views:
**2547**

### Re: Simplifying

I had just found the Wolfram Alpha site about an hour before I read that post! Great stuff!! I really like the plotting function.

Here's a problem that has been giving me some trouble. How do I set this up to solve it?

Find the area bounded by the following; y = -x, the x axis and x = 5

Thanks!

Here's a problem that has been giving me some trouble. How do I set this up to solve it?

Find the area bounded by the following; y = -x, the x axis and x = 5

Thanks!

- Tue Feb 01, 2011 1:45 am
- Forum: Number
- Topic: Simplifying
- Replies:
**6** - Views:
**2547**

### Re: Simplifying

Thanks! That website should prove very useful to check solutions that my book doesn't have. I still might need some help from time to time with how to set up a word problem or something, so it's nice to know that there is a knowledgeable and friendly group of folks that is willing to point me in the...

- Mon Jan 31, 2011 8:09 pm
- Forum: Number
- Topic: Simplifying
- Replies:
**6** - Views:
**2547**

### Simplifying

Hi All, I'm new here and I'm hoping to get a little help. My math abilities are far below that of most of you, so I hope that someone like me is welcome here. I have to simplify the following: (3x 3 + 6x 2 + 2x - 4) - (2x 3 - 3x 2 - 2x + 4) Here is what I came up with: x 3 + 9x 2 + 4x - 8 Am I on th...