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Aug
29
awarded  Yearling
Aug
27
comment A question on function
Hint: $y^2 + 2y + 1 = (y+1)^2$ - Use this to simplify R.H.S. and see where you get.
Aug
27
comment Given a set of three-vectors, how to approximate any other vector?
Clarify the relationship between [r_reference g_reference b_reference] and [r_sample g_sample b_sample] or re-edit the data shown to appear under appropriate columns.
Aug
27
comment Raising an adjacency matrix to a power: Why does it work?
Look at the book:Linear Algebra: A Modern Introduction - Page 243 - Section 3.7 on Google books:books.google.com.eg/…
Aug
27
comment Raising an adjacency matrix to a power: Why does it work?
Similar to:math.stackexchange.com/questions/231841/…
Aug
25
comment Geometry-Is this a correct question?
I guess there is no x angle. There is an angle of value 2x only,
Aug
25
comment Geometry-Is this a correct question?
Note that from your drawing, 2x+z can't be 100
Aug
25
comment How many different words can be formed using the letters of the word “ PERMUTACION”?
Maybe you can use this as a guide to re-formulate your question: How many (different/unique) permutations of (some/all/of min length x/of max length y) of the letters in the string "permutacion" (with at most/least n repetitions) allowed.
Aug
25
comment How many different words can be formed using the letters of the word “ PERMUTACION”?
Define what a 'word' is first. Example: Is PEEE a word? or is P a word?
Aug
25
comment Pattern matching puzzles
@MichaelHoppe, could you please explain why this approach should not be used?
Aug
23
comment Does $f(x) = ln(1+2x+2x^2) - 2x$ have a critical point at x = 0?
See conditions of inflection point here:en.wikipedia.org/wiki/Inflection_point
Aug
23
comment matrix multiplication questions
See: math.stackexchange.com/questions/170241/…
Aug
23
comment Guessing how many times a smaller number goes into bigger number
The typical approach is to use $ln$ function. Since you have no tools to help you, maybe this manual method could help:calculus-geometry.hubpages.com/hub/…
Aug
23
comment Why I'm getting wrong answer? What is wrong in my solution?
Partial Fractions approach is the key concept to solve this problem.
Aug
22
comment What is the interest of duality in algebra, and in general in mathematics?
This may be related:en.wikipedia.org/wiki/Duality_(mathematics) There are other types as in:en.wikipedia.org/wiki/Duality_principle - I suggest you make your question a bit more specific if possible.
Aug
22
revised How to convert a decimal to a fraction easily?
Added relevant links
Aug
22
comment How to convert a decimal to a fraction easily?
thanks again for the explanation.
Aug
21
comment Solving a rational equation with multiple and nested fractions
To simplify the expression abit, use $y=0.5$.
Aug
21
comment When is $\sqrt{a^2}=\pm a$ and when is $\sqrt{a^2}=a$?
@5xum, excellent point. Thanks.
Aug
21
comment When is $\sqrt{a^2}=\pm a$ and when is $\sqrt{a^2}=a$?
Since $\sqrt{a^2} = |a|$ for all real values of $a$. Just wondering, how about $(-a)$ as a solution?