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by stapel_eliz
Sat May 07, 2016 12:59 pm
Forum: News
Topic: firewall settings
Replies: 0
Views: 170

firewall settings

Apologies for the forum's recent errors. A firewall setting went bad and blocked much access. Everything should be fine again now.

Thank you for your patience.
by stapel_eliz
Thu Mar 10, 2016 6:11 pm
Forum: Trigonometry
Topic: 10 Trigonometric Equation
Replies: 1
Views: 553

Re: 10 Trigonometric Equation

I am solving a paper with 45 questions and out of which i have 10 questions for which i am not getting solutions. If at any cost you are having solution please let me know. Although the questions are in images. Please check the link and let me know if you can find the solution. Can even pay if you ...
by stapel_eliz
Sat Jan 30, 2016 10:14 pm
Forum: Calculus
Topic: Interpolation of a series of data points via Chebyshev approximation
Replies: 1
Views: 572

Re: Interpolation of a series of data points via Chebyshev approximation

Lacking specifics, it is difficult to respond. I suspect that the responses posted here are about as good as you'll get. Good luck! :wink:
by stapel_eliz
Thu Jan 21, 2016 6:15 pm
Forum: News
Topic: EU-compliant "cookies" notice added
Replies: 0
Views: 1292

EU-compliant "cookies" notice added

The learning forums, in addition to the rest of the Purplemath site, have added an EU-compliant notice about privacy and cookies. If this is the first time you've logged in since 20 January 2016 (or if you have cleared your cookies since that time), you'll see the notification bar across the top of ...
by stapel_eliz
Sun Jan 10, 2016 3:01 am
Forum: Matrix (Linear) Algebra
Topic: Decoding matrix
Replies: 3
Views: 728

Re: Decoding matrix

Hi, the question from my work asks to find out coding matrix and it is represented as below * * * 1 0 * * * 0 1 It states use row operations to reduce the following matrix to the above form 1 1 1 1 1 1 2 3 4 0 and it a mod 5 matrix. Having the actual (full and exact) text of the original exercise w...
by stapel_eliz
Sat Jan 09, 2016 11:44 pm
Forum: Matrix (Linear) Algebra
Topic: Decoding matrix
Replies: 3
Views: 728

Re: Decoding matrix

I am stuck on reducing the following matrix. It is supposed to be in H = CI format where C = Coding matrix and I = Identity matrix 1 1 1 1 1 1 2 3 4 0 and its a mod 5 matrix What do you mean by "reducing" this matrix? I am wondering if anyone could help me reduce the above matrix to follo...
by stapel_eliz
Sat Dec 19, 2015 1:05 am
Forum: Matrix (Linear) Algebra
Topic: Find basis and dimension of a vector space
Replies: 4
Views: 685

Re: Find basis and dimension of a vector space

Could you respond on solving this problem? Where are you stuck with what they gave you elsewhere? Let p(x) = a_0 + a_1 x + a_2 x^2 + a_3 x^3 be a polynomial of degree 3. The polynomial p(x) is in W if and only if a_0 + a_1 + a_2 + a_3 = 0. Thus it easy to see that the polynomials p_1(x) = 1 - x, p_...
by stapel_eliz
Sat May 23, 2015 9:07 pm
Forum: Intermediate Algebra
Topic: Substituting a Zero into a negative variable
Replies: 8
Views: 1373

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: 1247

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: 2686

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.

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