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Subhotosh Khan
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Subhotosh Khan
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Join Date
06-18-2007
Last Activity
Yesterday
09:30 PM
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Yesterday,
03:15 PM
Subhotosh Khan
replied to a thread
Equation of a tangent line
in
Calculus
y = (6-2x)^1/2 dy/dx = 1/2 *(-2) * (6-2x)^(-1/2) at x = 1 → dy/dx = -1/2 and y = 2 equation of the tangent line: y - 2 = (-1/2) * (x - 1)...
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3 replies | 65 view(s)
Yesterday,
07:49 AM
Subhotosh Khan
replied to a thread
Please help me solve this integral
in
Calculus
Apply integration by parts again on the resulting integral.
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6 replies | 124 view(s)
Yesterday,
07:46 AM
Subhotosh Khan
replied to a thread
Please help me solve this integral
in
Calculus
No .... that does not work here....
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6 replies | 124 view(s)
Yesterday,
07:40 AM
Subhotosh Khan
replied to a thread
solve the inequality e^x - ln(x) <= e/x for x
in
Calculus
First step - simplify e^ln(x) = ?? Second step - What is the domain of the expression above? continue....
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6 replies | 126 view(s)
05-20-2018,
08:27 PM
Subhotosh Khan
replied to a thread
solve the inequality e^x - ln(x) <= e/x for x
in
Calculus
What are your thoughts regarding the assignment? Please share your work with us ...even if you know it is wrong. If you are stuck at the...
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6 replies | 126 view(s)
05-20-2018,
08:23 PM
Subhotosh Khan
replied to a thread
Maximize Profit (Calc I): C(x)=x^3-60x^2+1400x+1000 for 0<=x<=50
in
Calculus
For 'x' units sold: Profit = 563*x - (x^3-60x^2+1400x+1000) Now maximize it!
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2 replies | 61 view(s)
05-20-2018,
01:32 PM
Subhotosh Khan
replied to a thread
Fundamental theorem of algebra question: Why/how does q(x) = a_n ?
in
Beginning Algebra
You did answer it yourself!!!
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7 replies | 204 view(s)
05-20-2018,
06:57 AM
Subhotosh Khan
replied to a thread
Want to get better at algebra
in
Intermediate/Advanced Algebra
Welcome.... Two of the resources: purplemath.com KhanAcademy videos There are some simple strategies for "isolating" variables.
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2 replies | 94 view(s)
05-19-2018,
08:59 PM
Subhotosh Khan
replied to a thread
Equal trapazoids around the circumference of a circle
in
Geometry and Trig
What is the outer circumference of the deck? = Pi * (484) Divide that into 17 equal parts. What do you get?
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2 replies | 135 view(s)
05-19-2018,
08:16 PM
Subhotosh Khan
replied to a thread
Help w/ composition fcns f(g(x)), g(f(x)), given f(x) = (2/x), g(x) = x^2+x-1
in
Intermediate/Advanced Algebra
Does x = 0.75 satisfy your equation 2x^2 = -x^4 + x^3 + 7x^2 + 2x - 4]?
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7 replies | 200 view(s)
05-19-2018,
06:16 PM
Subhotosh Khan
replied to a thread
Proof help! integration -
in
Calculus
You are being asked: If y =\sqrt{ r^2 - x^2} (a) \frac{dy}{dx} = ? (b) Show that: \displaystyle{\int_{-r}^{+r}...
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1 replies | 91 view(s)
05-19-2018,
02:02 PM
Subhotosh Khan
replied to a thread
How to find the minimal distance between a 2D point and a 2D line?
in
Beginning Algebra
Determine the equation of the line through points (-10, -12) and (5, 3). Then calculate the perpendicular distance of the line from the...
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1 replies | 89 view(s)
05-19-2018,
01:58 PM
Subhotosh Khan
replied to a thread
Old account issue: please help
in
Administration Issues
I have deleted all the "personal" profile info from the profile page of Marshall1432. Do you think that is sufficient?
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10 replies | 398 view(s)
05-19-2018,
12:32 PM
Subhotosh Khan
replied to a thread
Old account issue: please help
in
Administration Issues
Send me your old user ID. I'll see what I can do.
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10 replies | 398 view(s)
05-19-2018,
11:58 AM
Subhotosh Khan
replied to a thread
solve eqn w/ variable in exponent using logarithms: 10*2^x - 8*5^(x-2) = 0
in
Intermediate/Advanced Algebra
solve: 10 * 2^x - 8 * 5^(x-2) = 0 2^(-2) * 2^x - 5^(-1) * 5^(x-2) = 0 Continue.....
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11 replies | 306 view(s)
05-19-2018,
11:49 AM
Subhotosh Khan
replied to a thread
Old account issue: please help
in
Administration Issues
This is Subhotosh Khan. I have been volunteer/mod for this forum for multiple years. However, I do not know the "mechanics" of totally...
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10 replies | 398 view(s)
05-19-2018,
09:49 AM
Subhotosh Khan
replied to a thread
Help w/ composition fcns f(g(x)), g(f(x)), given f(x) = (2/x), g(x) = x^2+x-1
in
Intermediate/Advanced Algebra
This equation does not have "rational roots". The only way I see to solve this is through numerical methods.
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7 replies | 200 view(s)
05-18-2018,
07:46 AM
Subhotosh Khan
replied to a thread
AS paper: Prove every prime > 5, when raised to 4th power, ends in 1
in
Intermediate/Advanced Algebra
I suggest we should let the OP discover the answer with nudge and help. Denis - you are trying to be new Soroban.......
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8 replies | 216 view(s)
05-18-2018,
07:40 AM
Subhotosh Khan
replied to a thread
Please HELP !! Propositional Logic: Demonstrate this: (p ∧ q) ↓ q ≡ ¬q
in
Intermediate/Advanced Algebra
Do you know the meaning of those symbols? What does your class-notes say?
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2 replies | 121 view(s)
05-18-2018,
07:35 AM
Subhotosh Khan
replied to a thread
Sigma Q: sum[k=1,4]5k^2 (don't understand their solution ?)
in
Intermediate/Advanced Algebra
From knowing a-priori: 1 + 22 + 32 + 42.....+ (n-1)2 + n2 = 1/6 * n * (n+1) * (2n+1) Do a google-search on "sum of square series" for detailed...
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2 replies | 197 view(s)
05-18-2018,
07:28 AM
Subhotosh Khan
replied to a thread
Using Lagrange multipliers w/ f(x,y,z)=x^2-3y^2-z^2+6 subj. to 5x-3y+z=21
in
Calculus
Using MS-excel and matrix inversion, I get: x = 3.62069 y = 0.724138
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3 replies | 135 view(s)
05-17-2018,
08:35 PM
Subhotosh Khan
replied to a thread
Correcting data readings of humidity, temperature in building project
in
Beginning Algebra
These types of corrections are dependant on the manufacturer. I suggest you contact them.
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4 replies | 128 view(s)
05-17-2018,
04:10 PM
Subhotosh Khan
replied to a thread
Mass of sphere using areal density which varies linearly w/ dist. from x,y-plane
in
Calculus
You do not need to use spherical co-ordinates. Consider a disk at a distance Z from the origin (center) with a thickness dz (made by slicing...
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2 replies | 85 view(s)
05-17-2018,
03:59 PM
Subhotosh Khan
replied to a thread
Determine Cubic Feet Used: For one quarter, a home owner's water bill was $9.38.
in
Arithmetic
What cubic feet * $0.40/100 cubic feet = ($9.38 - $6.50) + 1,200 cubic feet? ..... This equation is incorrect It is dimensionally incorrect - as...
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12 replies | 415 view(s)
05-17-2018,
03:53 PM
Subhotosh Khan
replied to a thread
Help translating word problem: "Carlos began with twice as much money as David had."
in
Pre-Algebra
After $12 changing hand - we know that: - = 10 - = 10 = + 10 continue.....
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4 replies | 207 view(s)
05-17-2018,
03:32 PM
Subhotosh Khan
replied to a thread
Reparameterization of ellipse c(t)=(2sint, cost), and parabola y=x^2/2
in
Advanced Math
I cannot understand your answer (c1(s)=(2sin*s/2, cos*s/2)). Please share your work.
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2 replies | 63 view(s)
05-17-2018,
03:30 PM
Subhotosh Khan
replied to a thread
A Challenge worth the time
in
Advanced Math
It looks like gibberish on my screen .....
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2 replies | 99 view(s)
05-17-2018,
03:28 PM
Subhotosh Khan
replied to a thread
AS paper: Prove every prime > 5, when raised to 4th power, ends in 1
in
Intermediate/Advanced Algebra
I prime number above 5, cannot have 2, 4, 6, 8 or 0 at the unit digit. It cannot have 5 either. Now what.....
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8 replies | 216 view(s)
05-17-2018,
09:23 AM
Subhotosh Khan
replied to a thread
Delta Question: What is the slope of the function y = x2 at x = 3 ?
in
Calculus
No - it came from: (a + b)2 = a2 + b2 + 2*a*b
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4 replies | 149 view(s)
05-17-2018,
09:17 AM
Subhotosh Khan
replied to a thread
Partial Differentiation: If v = log(x^3+y^3+z^3-3xyz), show (∂/∂x + ∂/∂y + ∂/∂z)v =
in
Calculus
Please share your work with us - so that we assist you properly.
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4 replies | 97 view(s)
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About Subhotosh Khan
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“... mathematics is only the art of saying the same thing in different words” - B. Russell
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Yesterday
09:30 PM
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06-18-2007
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