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tkhunny
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tkhunny
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04-12-2005
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02:52 PM
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Today,
02:46 PM
tkhunny
replied to a thread
Geometric Series - partial sum (real-world difficulty)
in
Intermediate/Advanced Algebra
It is a difficult question to discuss when one doesn't really have the vocabulary or experience to discuss it. Let's see how far we can get... ...
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2 replies | 40 view(s)
Yesterday,
09:26 PM
tkhunny
replied to a thread
Show that λ is an eigenvalue of the B matrix iff λ is an eigenvalue of B'
in
Calculus
Try arbitrary values. Maybe a, b, c, and d.
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13 replies | 539 view(s)
Yesterday,
09:23 PM
tkhunny
replied to a thread
Solve sec 2x = 2 between -Pi < x < Pi (can't find all the soln values)
in
Geometry and Trig
Too late. We already minded. Good work.
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7 replies | 292 view(s)
Yesterday,
05:44 PM
tkhunny
replied to a thread
help with limits of sequences
in
Calculus
Unfortunately, you have not shown us any work of your own. You must have something or it is entirely unfair to have given you these problems on an...
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1 replies | 25 view(s)
Yesterday,
05:35 PM
tkhunny
replied to a thread
Determine the interval of x
in
Intermediate/Advanced Algebra
I tend to recommend you first solve x(x+2) = 0 and see if you can gain any insight. Then, I might solve x(x+4) = 5 and see if any insight can be...
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2 replies | 91 view(s)
Yesterday,
05:33 PM
tkhunny
replied to a thread
Show that λ is an eigenvalue of the B matrix iff λ is an eigenvalue of B'
in
Calculus
You seem to be done. Is there anything else you need to demonstrate to accomplish your purpose?
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13 replies | 539 view(s)
12-16-2017,
10:32 PM
tkhunny
replied to a thread
Need help conceptually with eigenvector solution
in
Intermediate/Advanced Algebra
Please show your characteristic equation and explain why you did not get \lambda = 0 as an Eigenvalue.
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1 replies | 73 view(s)
12-16-2017,
10:26 PM
tkhunny
replied to a thread
Show that λ is an eigenvalue of the B matrix iff λ is an eigenvalue of B'
in
Calculus
You have answered my question for this single matrix. What does it mean for the Eigenvalues if you get EXACTLY the same Characteristic equation? ...
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13 replies | 539 view(s)
12-15-2017,
05:10 PM
tkhunny
replied to a thread
3 equations 3 variables: k_1e^{k_2^0}+k_3=0, k_1e^{k_2^(0.1)}+k_3=1...
in
Intermediate/Advanced Algebra
Okay they are "Additive Inverses", but one normally would not drop the "Additive". I'm willing to submit to other opinions.
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12 replies | 325 view(s)
12-15-2017,
10:22 AM
tkhunny
replied to a thread
What is the upper and lower bound of 44/3 sqaured?
in
Arithmetic
You'll have to be substantially more specific with what it is that is wanted. 1) On can easily calculate the exact value. Why do we need bounds?...
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1 replies | 77 view(s)
12-15-2017,
10:16 AM
tkhunny
replied to a thread
3 equations 3 variables: k_1e^{k_2^0}+k_3=0, k_1e^{k_2^(0.1)}+k_3=1...
in
Intermediate/Advanced Algebra
It appears that k3 is generally missing from your equations. In any case, why not substitute this into the other two equations and continue your...
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12 replies | 325 view(s)
12-14-2017,
07:10 PM
tkhunny
replied to a thread
Volume of a solid using shell method: y=x. , y= -x/2 , x=2 about y-axis
in
Calculus
Take two numbers, say 10 and 2. Is the distance between them 10+2 = 12 or 10-2 = 8?
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2 replies | 151 view(s)
12-14-2017,
07:08 PM
tkhunny
replied to a thread
Deduce formula from spreadsheet calculation
in
Beginning Algebra
Doe it ALWAYS produce 5%?
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3 replies | 124 view(s)
12-14-2017,
11:47 AM
tkhunny
replied to a thread
Integration of Logarithmic Functions: int [ e^x (e^x + 1)^2 ] dx
in
Calculus
Try u = e^{x} + 1. Please read and heed my signature. This has other implications, such as, if you get two different answers, one of them most...
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4 replies | 207 view(s)
12-14-2017,
11:42 AM
tkhunny
replied to a thread
Volume of a solid using shell method: y=x. , y= -x/2 , x=2 about y-axis
in
Calculus
?? Why have you added it? The distance between two curves is obtained by subtraction. Maybe I'm not understanding your question.
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2 replies | 151 view(s)
12-14-2017,
10:23 AM
tkhunny
replied to a thread
Limit, x->2, [sqrt{x+2} - sqrt{3x-2}] / [sqrt{5x-1} - sqrt{4x+1}]
in
Calculus
You gave up too soon AND you already did too much work trying to multiply that annoying numerator. Do this: 1) Do NOT multiply the complicated...
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1 replies | 103 view(s)
12-14-2017,
10:20 AM
tkhunny
replied to a thread
Weight factors (values): rho(q_0, q_1) = w_t ||X_0 - X_1|| + w_r f(R_0, R_1)
in
Advanced Math
For many models, if your translations and rotations can be treated as Random Variables, then the reciprocal of the Variance can produce acceptable...
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1 replies | 153 view(s)
12-13-2017,
08:57 PM
tkhunny
replied to a thread
Calculus II: Vol. of Rev. about y-axis (region bounded by y^2 = x, x = 2y)
in
Calculus
1) x = 2y and x = y^2 intersect at (0,0) and (4,2). Let's work on that, first. 2) Looking from the y-axis, maybe standing at (0,1), and moving in...
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2 replies | 114 view(s)
12-13-2017,
12:21 PM
tkhunny
replied to a thread
Solving 2 equations, 2 unknowns (Money Growth = Inflation + Real growth rate)
in
Beginning Algebra
Have you considered substituting the expression for "Inflation" from the second equation into "Inflation" from the first equation?
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8 replies | 312 view(s)
12-13-2017,
12:18 PM
tkhunny
replied to a thread
Finding x,y and λ values from partial derivatives
in
Calculus
You should try whatever methods are available to you to solve a system of equations. In this case, your predecessor seem of have produced, via...
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3 replies | 90 view(s)
12-13-2017,
12:10 PM
tkhunny
replied to a thread
Simple probability question event not occuring.
in
Probability / Statistics
If you have only one, it's a "die". Independent Events. Does any roll depend on any other roll? ^(1500) -- One must fail EVERY TIME.
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1 replies | 73 view(s)
12-13-2017,
12:06 PM
tkhunny
replied to a thread
Function plug-ins: Given F(x)=x^2+2x+7, g(x)= x+3, find (f+g)(x), (g*h)(x)
in
Intermediate/Advanced Algebra
Let's first assume that F(x) is the same as f(x). Normally, this is exceptionally bad form. Don't change letters to mean the same thing. What we...
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2 replies | 127 view(s)
12-13-2017,
12:02 PM
tkhunny
replied to a thread
Effective interest rate problem
in
Finance/Business Math
Compounding. It's a silly term.
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6 replies | 228 view(s)
12-12-2017,
11:56 AM
tkhunny
replied to a thread
Find Volume of Solid formed by revolving y=4−x^2, x-axis, y-axis about y=4
in
Calculus
There is a whole chapter on this in your book. I hope you have not been sleeping in class. Anyway... Consider a Right Circular Cylinder. It's...
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2 replies | 148 view(s)
12-12-2017,
11:41 AM
tkhunny
replied to a thread
Solve sec 2x = 2 between -Pi < x < Pi (can't find all the soln values)
in
Geometry and Trig
The answer is, "maybe". First, it behooves one to write ALL the solution and THEN pick the ones that are needed. No need to do the surgery up...
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7 replies | 292 view(s)
12-11-2017,
09:00 PM
tkhunny
replied to a thread
Solve sec 2x = 2 between -Pi < x < Pi (can't find all the soln values)
in
Geometry and Trig
1) cos(2x) = 1/2 has more than one solution, even on (-pi/2,pi/2). This is a natural result of the circle definition of the cosine. You must find...
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7 replies | 292 view(s)
12-11-2017,
08:51 PM
tkhunny
replied to a thread
The Brown Family Children: Charlie is the oldest child in the Brown family....
in
Beginning Algebra
It is very, very difficult for you to show your work if you just copy it from someone else. You MUST have SOME idea or it is horribly unfair for you...
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4 replies | 184 view(s)
12-11-2017,
11:17 AM
tkhunny
replied to a thread
non homogeneous general solution to d^2x/dt^2 + 2dx/dt-3x=5e^-t+sin3t
in
Differential Equations
In order for anyone to check your work, you will have to show some work. Just dropping your final answer doesn't help anyone. What methods did...
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1 replies | 122 view(s)
12-10-2017,
08:58 PM
tkhunny
replied to a thread
Finding the x-intercept of f(x) = x + cos(x)
in
Calculus
No, I think you have it. There are many interesting methods for finding numerical solutions where your algebraic efforts prove insufficient. Some...
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1 replies | 133 view(s)
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"Unique Answers Don't Care How You Find Them." - Many may have said it, but I hear it most from me.
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