- Sat May 23, 2015 9:07 pm
- Forum: Intermediate Algebra
- Topic: Substituting a Zero into a negative variable
- Replies:
**8** - Views:
**58**

here is what i did: http://postimg.org/image/nicftcc37/ For others viewing this thread, the text in the image is, roughly, as follows: 1x^2\, +\, 0x\, +\, 1 substituted into \dfrac{-b\, \pm \, \sqrt{b^2\, -\, 4ac\,}}{2a} =\, \dfrac{-(0)\, \pm\, \sqrt{(0)^2\, -\, 4(1)(1&#...

- Thu May 21, 2015 6:29 pm
- Forum: Calculus
- Topic: Is it possible to evaluate this integral without a calculator?
- Replies:
**3** - Views:
**37**

Integral[x=0 to 2pi] [([(sin(x)+3)-ln(x+1)][cos(9x)+5])+(3/4)[pi[(sin(x)+3)-ln(x+1)][cos(9x)+5]]]dx Is the integral (posted above as ASCII "art") meant to be as follows? . . . . . \int_{x = 0}^{2\pi}\, \left[\...

- Thu May 14, 2015 10:14 pm
- Forum: News
- Topic: forum upgrade in progress
- Replies:
**1** - Views:
**694**

The upgrade was completed, and then updated. A recent (and possibly resumed today) DDoS attack made the site and this forum slow to respond, and many files were damaged somehow, which "broke" LaTeX for a while. But things seems to be working again now.

- Thu May 14, 2015 8:36 pm
- Forum: Beginning Algebra
- Topic: Help with a linear equation - don't know where to start :/
- Replies:
**1** - Views:
**91**

matheus wrote:I am completely stuck on some of these practice questions

tinypic

THIS IMAGE OR VIDEO

HAS BEEN

MOVED OR DELETED

Please post the questions.

When you type them out, please include all your work leading to your answers. Thank you!

- Sun May 03, 2015 5:22 pm
- Forum: Uncategorized
- Topic: two geodesics are parallel transports along another geodesic
- Replies:
**1** - Views:
**88**

Problem 8.3. Transversals through a Midpoint If two geodesics r and r' are parallel transports along another geodesic l, then they are also parallel transports along any geodesic passing through the midpoint of the segment of l between r and r'. Is ( this ) what you're talking about? If so, are the...

- Mon Mar 23, 2015 8:29 pm
- Forum: Matrix (Linear) Algebra
- Topic: Help with this matrix proof!
- Replies:
**1** - Views:
**365**

Prove that if A and B are m x m matrices, A is invertible, and C is the inverse of A, then e^(ABC)=A*e^(B)*C ? Use the identities A(E + F)C = AEC+AFC and (AEC)^n = AE^nC How does your book define raising the natural exponential e to a power, with that power being a matrix? Note: In general, (AB...

- Sun Mar 15, 2015 12:16 pm
- Forum: Matrix (Linear) Algebra
- Topic: 2 Linear Transformation Questions
- Replies:
**1** - Views:
**243**

F: R4--->R3 is the function defined by: F(x)= x1 + 2x2 +x3 2x1 +4x2 +7x3 + 5x4 x1 +2x2 +6x3 +5x4 Find the matrix of F, i.e. the matrix N such that F(x)= Nx. How is "Nx" defined? What is "N"? Find all values of t such that the set Y= {y1,y2,y3} is linearly dependent in R3, where ...

- Thu Feb 26, 2015 2:36 pm
- Forum: Discrete Math
- Topic: Find two proofs for the identity
- Replies:
**4** - Views:
**701**

What is "the double counting technique"? Does that refer to "combinatorial" methods? What is "the set" that you're supposed to be "counting"? Are the "two formulas" meant to be the two sides of the identity, so Formula 1 is C(2n, n) and Formula 2 is ...

- Tue Feb 03, 2015 3:43 pm
- Forum: News
- Topic: forum upgrade in progress
- Replies:
**1** - Views:
**694**

The script which runs this forum has been updated by the provider in a manner which has created the need for a partial "clean" install. As a result, the appearance and some features of the forum currently have a changed appearance. The forum appears to be functional. If you encounter any e...

- Fri Jan 16, 2015 12:05 pm
- Forum: Beginning Algebra
- Topic: Domain and Range of a relation
- Replies:
**5** - Views:
**1086**