Tagged Questions
5
votes
4answers
118 views
Arithmetic mean is less than geometric mean (Spivak Calculus 3rd Chapter 2 Problem 22)
If $a_1, \ldots, a_n \ge 0$, the arithmetic mean $$A_n={a_1 + \cdots + a_n \over n}$$ and the geometric mean $$G_n = \sqrt[n]{a_1 \cdots a_n}$$ satisfy $G_n \le A_n$.
As a first step to prove this ...
9
votes
3answers
190 views
Being ready to study calculus
Some background: I have a degree in computer science, but the math was limited and this was 10 years ago. High school was way before that. A year ago I relearnt algebra (factoring, solving linear ...
6
votes
5answers
280 views
Calculus book recommendations (for complete beginner)
Well I have not started calculus yet but I am really keen to.
I would love if you suggest some books.
Points to be noted:
I really don't like the way textbooks are written so please no "textbooks"
...
6
votes
2answers
163 views
Filling the gap in knowledge of algebra
Recently, I realize that my inability to solve problems, sometimes, is because I have gaps in my knowldge of algebra. For example, I recently posted a question that asked why $\sqrt{(9x^2)}$ was not ...
18
votes
3answers
665 views
I want to get good at math, any good book suggestions?
I have never been good at math. In my senior year I failed algebra 2 in the first semester because the teacher would refuse to show me how to solve problems saying that it's my fault for not paying ...
0
votes
2answers
54 views
simplify by multiplying by -1 ( Solving equations in terms of a variable)
I am trying to learn Algebra. I'm using Khan Academy, and I just "solved" this problem.
I understand all the steps, except #4.
Could someone please tell me why I would multiply by -1 to simplify the ...
3
votes
2answers
246 views
Algebra book(s): Beginner through to advanced
I admit, I am not great at Maths; I'm situated in one off the lowest Maths class for my year, partly due to myself losing focus last year. Though, I like maths, I really do. Especially since I do a ...
2
votes
2answers
355 views
Percent change over time
I have the following data:
$$\begin{array}{c|c|c}2010 & 2011 & 2012 \\\hline 50 & 20 & 30 \\\end{array}$$
How would the percent change be calculated?
Like this:
...
0
votes
1answer
327 views
Good book to help me relearn Algebra 1…
In 8th grade I took Algebra 1 and did not learn a thing.I am now in Cal AB and making B's.
I was hoping to reteach myself Algebra 1 this summer by watching Khan Academy and reading a book on Algebra ...
3
votes
2answers
69 views
Problem based on Composite Functions.
Let $f(x) = \sin^{2}{x} + \sin^{2}\left(x + \frac{\pi}{3}\right) + \cos{x}\cos\left(x + \frac{\pi}{3}\right)$
and $g(x) = \left\{\begin{array}{rcc} 2x,\quad0\le x<1 \\x + \frac{1}{4},\quad 1 \le ...
3
votes
2answers
309 views
What's a good progression/path for self-educating from pre-algebra and beyond?
I never got very far in my math studies; I took zero math in college and had terrible teachers in high school. Fast forward to today and I'm a professional developer who's starting to feel that my ...
3
votes
2answers
337 views
Looking for a good precalculus/algebra reference
I'm working my way through Calculus, 9th ed. by Larson and Edwards in independent study. The problem is that many of the exercises and examples use a lot of algebra tricks that are glossed over and ...
5
votes
2answers
448 views
Does anyone know of any good ways to get good at algebra without as much“grind” as doing hundreds of questions a night
I'm coming to a point in college where I can't avoid my math classes any longer. I need to get better at algebra so I don't flunk out of the class when I take it, however I've never been able to get ...
2
votes
2answers
267 views
Good SAT learning resources?
I'm looking to brush up on SAT math. (That's basic algebra, probability and trigonometry.)
I'm interested in books and websites.
6
votes
4answers
326 views
What are some good resources for brushing up on geometry and trigonometry?
I'm brushing up on my calculus, and geometry and trigonometry keep coming up. However, these are probably my weakest areas mathematically. Are there any good sites or free PDFs/ebooks that I can use ...
