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Today,
01:54 PM
JeffM
replied to a thread
Algebraic Fraction Help
in
Arithmetic
No. I just misread it. Thanks. I'll fix my post.
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5 replies | 28 view(s)
Today,
01:53 PM
Subhotosh Khan
replied to a thread
Algebraic Fraction Help
in
Arithmetic
I had skipped mentioning \ x \ne \pm 1 - hoping that OP will catch that. At x=-1, the given function would have a removable discontinuity.
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5 replies | 28 view(s)
Today,
01:32 PM
pka
replied to a thread
Sample Space Confusion
in
Probability / Statistics
It think that you need to put your question to your teacher. Almost nothing in mathematics like this has a standard answer. In my classes I would...
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2 replies | 17 view(s)
Today,
01:16 PM
tkhunny
replied to a thread
Linear Algebra - Find Matrix that fits the criteria
in
Intermediate/Advanced Algebra
If all else fails, you can Brute Force it. A = \begin{pmatrix}a & b \\ c & d\end{pmatrix} What do you get for A^2\;then\;A^{2} = I_{2}? Does...
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1 replies | 12 view(s)
Today,
01:15 PM
Dr.Peterson
replied to a thread
Algebraic Fraction Help
in
Arithmetic
Are you assuming there was a typo in the problem, and it really says x2 rather than x-2 in the denominator? As given, the problem does imply that...
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5 replies | 28 view(s)
Today,
01:12 PM
Dr.Peterson
replied to a thread
Sample Space Confusion
in
Probability / Statistics
In order to use this definition of probability, it is necessary that each of the "possible outcomes" have the same probability -- they must be...
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2 replies | 17 view(s)
Today,
12:36 PM
tkhunny
replied to a thread
Binomial expansion problem
in
Intermediate/Advanced Algebra
In a pinch, with only a few terms, just write them ALL down. This will also help you internalize the formula for immediately writing a single term....
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1 replies | 19 view(s)
Today,
12:15 PM
j-astron
replied to a thread
Representing a view of a 3D sphere as a 2D circle?
in
Geometry and Trig
Hey @Fillipuster: Can you explain what you mean by "precision?" Any raster-graphic is going to have finite precision, because it has pixels of...
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3 replies | 78 view(s)
Today,
11:46 AM
JeffM
replied to a thread
Algebraic Fraction Help
in
Arithmetic
Why not simply factor the denominator? \dfrac{x + 1}{1 - x^2} = -\ \dfrac{x + 1}{x^2 - 1} = -\ \dfrac{x + 1)}{(x + 1)(x - 1)} = - \ \dfrac{1}{x -...
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5 replies | 28 view(s)
Today,
11:32 AM
Julton
started a thread
Sample Space Confusion
in
Probability / Statistics
I am working through probability questions in a maths book. The Sample Space is defined as the "list of all possible outcomes". The probability...
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2 replies | 17 view(s)
Today,
11:25 AM
Subhotosh Khan
replied to a thread
Solve R
in
Calculus
Do you know Newton-Raphstone method of approximating roots of algebraic equations.
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1 replies | 16 view(s)
Today,
10:47 AM
JeffM
replied to a thread
help with induction
in
Intermediate/Advanced Algebra
When using induction to prove that the proposition is true for k + 1, you use the fact that the proposition is true for k (and perhaps also the fact...
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11 replies | 133 view(s)
Today,
10:42 AM
AndreF
started a thread
Solve R
in
Calculus
Hi. I have the following problem and need to solve r. 26,51= ((10,360232)/((1+r)^4)))+((11,29265288)/((1+r)^5)))+((12,3089916392)/((1+r)^6)))...
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1 replies | 16 view(s)
Today,
10:15 AM
Dr.Peterson
replied to a thread
What is the LCM of 2.5, 1.2, 20 and 7.5? (Help me...where did I go wrong with this?)
in
Arithmetic
Please show what you did; otherwise, we can only guess where you went wrong!
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1 replies | 16 view(s)
Today,
09:59 AM
Subhotosh Khan
replied to a thread
o.k. here it goes
in
Pre-Algebra
Assume your total investment was = $100 Then you had total gain of $6.50 Your non-stock investment lost $2.50 So your $50 stock investment...
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1 replies | 19 view(s)
Today,
09:50 AM
Subhotosh Khan
replied to a thread
Algebraic Fraction Help
in
Arithmetic
\displaystyle{\dfrac{x \ + \ 1}{1 \ - \ \frac{1}{x^2}}} I would first multiply numerator and denominator by x2 , assuming x \ne 0
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5 replies | 28 view(s)
Today,
09:49 AM
Denis
replied to a thread
A rebus
in
Math Odds & Ends
He with nary a smile Is but the shadow of his inner child “A professor is someone who talks in someone else’s sleep”:rolleyes:
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7 replies | 231 view(s)
Today,
09:42 AM
Subhotosh Khan
replied to a thread
Limits of integration
in
Calculus
The first thing I would do is to approximately sketch the situation. z=x will be a plane that will contain the y-axis and the line z=x on x-z...
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1 replies | 15 view(s)
Today,
09:30 AM
Dr.Peterson
replied to a thread
help with induction
in
Intermediate/Advanced Algebra
You're showing a denominator here only to indicate that you want to show this division will yield an integer, right? It isn't necessary to do that;...
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11 replies | 133 view(s)
Today,
09:20 AM
Dr.Peterson
replied to a thread
help with induction
in
Intermediate/Advanced Algebra
If you are learning induction, you don't need to understand what he did (unless you choose to).
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11 replies | 133 view(s)
Today,
09:17 AM
Dr.Peterson
replied to a thread
Height of a tree
in
Arithmetic
I suggested how; does my assumption that you are learning about scale drawings and the like fit what you have been doing? Can you follow my...
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6 replies | 71 view(s)
Today,
07:47 AM
shangkarao
replied to a thread
help with induction
in
Intermediate/Advanced Algebra
thank you, but i need a different proof. i also didn't fully understand what you did.
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11 replies | 133 view(s)
Today,
07:32 AM
anon321
started a thread
What is the LCM of 2.5, 1.2, 20 and 7.5? (Help me...where did I go wrong with this?)
in
Arithmetic
a) 60 b) 65 c) 70 d) 50 Answer is a) 60. Please explain me where I went wrong as my answer turned out to be 300.
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1 replies | 16 view(s)
Today,
06:31 AM
bumblebee123
replied to a thread
using calculus to solve a problem
in
Calculus
Sorry about that. It should read 9/(2t) + t Actually I probably need to show it like this: + t so its 9 divided by 2t and then you add t ...
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2 replies | 30 view(s)
Today,
06:25 AM
HallsofIvy
replied to a thread
using calculus to solve a problem
in
Calculus
Please use parentheses! Is this (9/2)t+ t or 9/(2t)+ t or 9/(2t+ t)? Since the first would be more simply written (11/2)t and the third 3/t, it is...
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2 replies | 30 view(s)
Today,
06:20 AM
diogomgf
started a thread
Linear Algebra - Find Matrix that fits the criteria
in
Intermediate/Advanced Algebra
Hello every one, first post here on the forum... I have been struggling with this problem for a while: Find a matrix A2x2 such that A2 = I2. ...
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1 replies | 12 view(s)
Today,
06:07 AM
bumblebee123
started a thread
using calculus to solve a problem
in
Calculus
Hi, So I have this problem: A particle moves along a line. For t (more than/equal to)1, the distance of the particle from O at time t is x meters,...
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2 replies | 30 view(s)
Today,
05:08 AM
HallsofIvy
replied to a thread
help with induction
in
Intermediate/Advanced Algebra
I wouldn't use induction (at least not directly). (a+ 1)^n= \sum_{i= 0}^n \begin{pmatrix}n \\ i\end{pmatrix} a^i. Subtracting "na+ 1" starts the...
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11 replies | 133 view(s)
Today,
05:03 AM
iitsrii
started a thread
Binomial expansion problem
in
Intermediate/Advanced Algebra
First 3 terms of (4-2x^-2)^5 first term is 4^5 which is 1024 4^4(1/2x^2) = 256/2x^-2 128/x^2 3rd term 64(1/2x^2)^2 = 64/2x^2 32/x not sure...
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1 replies | 19 view(s)
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