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by nona.m.nona
Thu Jul 14, 2016 6:43 pm
Forum: Intermediate Algebra
Topic: Sorry my ignorance but please help me to understand why x/sqr(x)
Replies: 2
Views: 344

Re: Sorry my ignorance but please help me to understand why x/sqr(x)

...he states that x/sqr(x) is equal to sqrt(x) which i obviously believe i typed x/sqrt(x) in wolfram alpha and it also gave me the result sqrt(x) but i don't understand why What did you get when you did the simplification? You noted that: \sqrt{ x^2\,}\, =\, x (for non-negative x) so: x\, =\, \lef...
by nona.m.nona
Thu Jul 14, 2016 6:34 pm
Forum: Beginning Algebra
Topic: Order of operations isn't working.
Replies: 3
Views: 260

Re: Order of operations isn't working.

I don't understand math; that's why I'm here. I thought that I was doing pemdas exactly...addition comes before subtraction. It seems to me that I'm doing exactly what they gave me. No. As explained in ( this ) lesson, addition and subtraction are at the same "level" and are done at the s...
by nona.m.nona
Sun May 15, 2016 12:29 pm
Forum: Calculus
Topic: How to prove the following function is increasing function?
Replies: 5
Views: 459

Re: How to prove the following function is increasing function?

Note to other viewers: This user has posted similar questions here, and has "voluntarily" removed them from here.
by nona.m.nona
Sun May 15, 2016 12:27 pm
Forum: Calculus
Topic: How to prove the following function is increasing function?
Replies: 5
Views: 459

Re: How to prove the following function is increasing function?

I am stuck on figuring out why the following function is a increasing function when I read a paper. The function is following f(x)\, =\, \dfrac{(x\, -\, 1)\, c^x\, -\, 2x\, c^{x-1}\,+\,x\,+\,1}{2^x\,-\,x\,-\,1}, \, \mbox{ with }\, 1\, <\, c\, <\, 2\, \mbox{ and }\, x\, >\, 2. This a...
by nona.m.nona
Sat May 07, 2016 1:22 pm
Forum: Matrix (Linear) Algebra
Topic: find rotation matrix in n dimention
Replies: 2
Views: 526

Re: find rotation matrix in n dimention

A fairly complete reply is posted here.
by nona.m.nona
Thu Jan 28, 2016 10:04 pm
Forum: Matrix (Linear) Algebra
Topic: matrix notation
Replies: 1
Views: 527

Re: matrix notation

Apologies, but I'm drawing a blank. Kindly please provide the exact text (or scan) of the "something" which generated your query. Thank you.
by nona.m.nona
Wed Jan 06, 2016 9:39 pm
Forum: Calculus
Topic: One more question: line tangent to y=2 sin(2 x+(3pi/4)) at x=pi/8
Replies: 4
Views: 1093

Re: One more question: line tangent to y=2 sin(2 x+(3pi/4)) at x=pi/8

bookwrm98 wrote:So pull out the 2, then do the derivative of sin(f(x)), and the final derivative equals 4cos(2x+(3pi/4)), then just find the line from there. Is that right?

You are correct.
by nona.m.nona
Tue Dec 15, 2015 3:30 am
Forum: Matrix (Linear) Algebra
Topic: Find basis and dimension of a vector space
Replies: 4
Views: 820

Re: Find basis and dimension of a vector space

\mbox{Find the basis and dimension of }\, V,\, W,\, V\, \cap\, W,\, V\, +\, W,\, \mbox{ where} To find the basis (singular) and dimension (singular), what follows would generally be required to be a singular item. But what follows appears to be a listing of (four) spaces. Which interpretation (sing...
by nona.m.nona
Fri Dec 04, 2015 8:43 pm
Forum: Calculus
Topic: x^2: any relation between d(x^2)/dx = 2x and diff. between 1, 4, 9, 16, ..., ?
Replies: 1
Views: 695

Re: x^2: any relation between d(x^2)/dx = 2x and diff. between 1, 4, 9, 16, ..., ?

Is there a relation between the fact that the derivative of x^2 is 2x and that the difference between 1,4,9,16, ... is 3, 5, 7, 9, ...? And why is the difference always 2? Are you perhaps referring to what is discussed on this page starting a little past halfway down the page? One might find it use...

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