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Today,
08:10 AM
JeffM
replied to a thread
Negative roots when simplifying surds
in
Pre-Algebra
That is very good. I'd make one slight emendation to your third point. I'd phrase it as The context of the equation should clarify if both...
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19 replies | 432 view(s)
Today,
06:35 AM
Ale_ygt
replied to a thread
Proving that lim(x,y)->(0,0) (x^2 + x|y|)/sqrt(x^2 + y^2) = 0
in
Calculus
I *think* I solved it using the limit definition; supposing that \lim_{(x,y) \to (0,0)}\frac{x^{2}+x|y|}{\sqrt{x^{2}+y^{2}}}=0 We have: ...
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4 replies | 129 view(s)
Today,
04:31 AM
NeedingWD40
replied to a thread
Negative roots when simplifying surds
in
Pre-Algebra
Thanks all, one clear message I've got is I need to clarify my sometimes foggy thought processes! So, to attempt to summarise: ⎷a is always...
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19 replies | 432 view(s)
Today,
03:49 AM
Otis
replied to a thread
Quaternion angle calculation
in
Advanced Math
I'm not able to help, but here's another reference site (StackExchange for developers). You may want to post your questions at that site, as well....
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1 replies | 151 view(s)
Today,
03:40 AM
Otis
replied to a thread
Silver bars
in
Finance/Business Math
Please excuse me, but I need help understanding the given scenario, as you've presented it. Comments follow. You wrote that the money goes to the...
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1 replies | 59 view(s)
Today,
01:00 AM
pka
replied to a thread
Negative roots when simplifying surds
in
Pre-Algebra
I did a very poor job explaining our objections. No one would ever need to use \sqrt{-16 i }. On the other hand there could be a need to solve...
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19 replies | 432 view(s)
Today,
01:00 AM
topsquark
replied to a thread
Proving that lim(x,y)->(0,0) (x^2 + x|y|)/sqrt(x^2 + y^2) = 0
in
Calculus
Yes, you can approach it that way as well. So long as your result comes out to be "0" no matter what m is (what about approaching with a vertical...
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4 replies | 129 view(s)
Today,
12:52 AM
shahar
replied to a thread
Function
in
Advanced Math
I don't want to put all the eggs in one basket but I think I have a lot of error. "We will know, we must know" (By Hilbert)
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1 replies | 73 view(s)
Today,
12:49 AM
shahar
started a thread
Function
in
Advanced Math
When the Modern History of Math define function, it only deal on quadratic equation and linear equation. The other equation are have a little...
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1 replies | 73 view(s)
Today,
12:27 AM
bthegreat
started a thread
Probably very easy question
in
Calculus
So I haven't taken a math class in 10 years and I'm having some issues getting back into it. I'm hiring a private tutor, but in the mean time can...
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0 replies | 45 view(s)
Yesterday,
11:07 PM
Jchum
started a thread
Silver bars
in
Finance/Business Math
So I have five silver bars all worth $2,100 each total price that's $10,500 the money goes to an estate where the feds take out half the profit. The...
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1 replies | 59 view(s)
Yesterday,
09:26 PM
Denis
replied to a thread
3 rebuses
in
Math Odds & Ends
Both correct. No: remaining one has nothing to do with bandleaders.
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4 replies | 153 view(s)
Yesterday,
09:23 PM
Denis
started a thread
Another silly "story"...
in
Math Odds & Ends
YELLOW FINGERS ============== Explanatory pause; you're wrong: this investigative document has nothing to do with...
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0 replies | 83 view(s)
Yesterday,
09:16 PM
Otis
replied to a thread
This question makes zero sense
in
Geometry and Trig
see more
14 replies | 262 view(s)
Yesterday,
09:09 PM
Otis
replied to a thread
Graphic methods, exponential growth and decay
in
Calculus
What you have done is integrate from t=0 through t=6. That won't help you plot points for function V(t), on a graph. You did not answer my...
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4 replies | 159 view(s)
Yesterday,
09:00 PM
Otis
replied to a thread
3 rebuses
in
Math Odds & Ends
Good solve, romsek. :cool: I'm thinking #2 has something to do with bandleaders …
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4 replies | 153 view(s)
Yesterday,
08:54 PM
Otis
replied to a thread
How do I use substitution when there is no pre solved variable?
in
Beginning Algebra
You substitute an expression for a variable, instead of a number. Solve one of the equations for x, and then substitute the resulting expression...
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2 replies | 112 view(s)
Yesterday,
08:52 PM
Romsek
replied to a thread
How do I use substitution when there is no pre solved variable?
in
Beginning Algebra
solve for one :P 3x+y=23\\ y = 23-3x
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2 replies | 112 view(s)
Yesterday,
08:49 PM
Romsek
replied to a thread
3 rebuses
in
Math Odds & Ends
**space invaders**
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4 replies | 153 view(s)
Yesterday,
08:48 PM
Ale_ygt
replied to a thread
Proving that lim(x,y)->(0,0) (x^2 + x|y|)/sqrt(x^2 + y^2) = 0
in
Calculus
I edited the 1st post adding some details on how I approached the issue without realizing that I got a reply meanwhile, my bad. It might be...
see more
4 replies | 129 view(s)
Yesterday,
08:17 PM
topsquark
replied to a thread
Proving that lim(x,y)->(0,0) (x^2 + x|y|)/sqrt(x^2 + y^2) = 0
in
Calculus
This one just screams "polar coordinates" to me. Try subbing x =r~cos( \theta ) and y = r~sin( \theta ). Then you simply have a limit as r \to 0. ...
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4 replies | 129 view(s)
Yesterday,
08:08 PM
topsquark
replied to a thread
This question makes zero sense
in
Geometry and Trig
I knew that. Really, I did. I, um, was ... testing you! Yeah, I was testing your reading comprehension. Yeah, that's what I was doing. -Dan
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14 replies | 262 view(s)
Yesterday,
08:02 PM
Ale_ygt
started a thread
Proving that lim(x,y)->(0,0) (x^2 + x|y|)/sqrt(x^2 + y^2) = 0
in
Calculus
Hi, I'm stuck with calculating the following limit (or rather proving it, since I already know the result): \lim_{(x,y) \to...
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4 replies | 129 view(s)
Yesterday,
08:01 PM
topsquark
replied to a thread
Negative roots when simplifying surds
in
Pre-Algebra
When I see stuff like "i"s under a radical I go straight over to the exponential format. \sqrt{-16 i } = \sqrt{16} \cdot \sqrt{-i} = 2 \cdot...
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19 replies | 432 view(s)
Yesterday,
07:35 PM
lookagain
replied to a thread
Negative roots when simplifying surds
in
Pre-Algebra
The above is incorrect. You need grouping symbols, such as below. I used asterisks for the products. e.g. ⎷300 - ⎷48 = ⎷(100*3) -...
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19 replies | 432 view(s)
Yesterday,
06:48 PM
Tombo
replied to a thread
Graphic methods, exponential growth and decay
in
Calculus
Thanks for answer. What i have done is calculate v between t=0s & t=6, but i think is wrong and this rule shouldnt be usend in this case Also...
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4 replies | 159 view(s)
Yesterday,
06:23 PM
Dr.Peterson
replied to a thread
how to simplify 784^2/3
in
Pre-Algebra
First, a comment on notation: fractional exponents, when written with inline "^" notation, require parentheses: 784^(2/3). Second, I formatted the...
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4 replies | 139 view(s)
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