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

Re: Substituting a Zero into a negative variable

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&#...
by stapel_eliz
Thu May 21, 2015 6:29 pm
Forum: Calculus
Topic: Is it possible to evaluate this integral without a calculator?
Replies: 3
Views: 37

Re: Is it possible to evaluate this integral without a calculator?

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[\...
by stapel_eliz
Thu May 14, 2015 10:14 pm
Forum: News
Topic: forum upgrade in progress
Replies: 1
Views: 694

Upgrade completed

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.
by stapel_eliz
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

Re: Help with a linear equation - don't know where to start :/

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

Re: two geodesics are parallel transports along another geodesic

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

Re: Help with this matrix proof!

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

Re: 2 Linear Transformation Questions

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

Re: Find two proofs for the identity

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

forum upgrade in progress

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

LJH wrote:Yes D is domain and R is Range. The instructions say to find the domain and range of this relation.

Okay. But the domain and range will depend upon what the function is. So kindly please provide the requested information: Is this y as a function of x, or x as a function of y? Thank you! :wink:

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