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Subhotosh Khan
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Subhotosh Khan
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Join Date
06-18-2007
Last Activity
Today
03:57 PM
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Today,
09:45 AM
Subhotosh Khan
replied to a thread
Sequence limit
in
Calculus
Is the expression you are investigating: \displaystyle{(x_n)^2 * \frac{y_n}{3}(x_n)^2 - 2 * x_n*y_{n+}(y_n)^2} ..... this is what you wrote or...
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2 replies | 39 view(s)
Today,
04:48 AM
Subhotosh Khan
replied to a thread
Math Equations transformation
in
Beginning Algebra
Calculate (1+r) = ? ...... then calculate 1/(1+r) = ? ...... then calculate r/(1+r) = ? What are your thoughts? Please share your work with us...
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1 replies | 38 view(s)
Yesterday,
06:34 PM
Subhotosh Khan
replied to a thread
Calculate f(-1)
in
Intermediate/Advanced Algebra
What are your thoughts? Please share your work with us ...even if you know it is wrong. If you are stuck at the beginning tell us and we'll...
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5 replies | 97 view(s)
Yesterday,
06:32 PM
Subhotosh Khan
replied to a thread
Induction Proof
in
Intermediate/Advanced Algebra
Is there any restriction on the domain of 'n' - integer, rational, real......?
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1 replies | 39 view(s)
Yesterday,
03:18 PM
Subhotosh Khan
replied to a thread
General Polynomials - polynomial of degree 4
in
Intermediate/Advanced Algebra
Can you sketch the function? Assuming all the roots of the function were given above - for one of those points it must be a multiple-zero.
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4 replies | 55 view(s)
Yesterday,
10:07 AM
Subhotosh Khan
replied to a thread
How would I solve the following using matrices?
in
Geometry and Trig
Have you studied matrix inversion?
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2 replies | 95 view(s)
09-19-2017,
09:41 AM
Subhotosh Khan
replied to a thread
Raising a power to a negative power
in
Pre-Algebra
.
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7 replies | 148 view(s)
09-18-2017,
01:03 PM
Subhotosh Khan
replied to a thread
Extremely hard trigo prob: "Nathan is swimming across a river from A to B..."
in
Geometry and Trig
Is the current in the river negligible? Looks like points A and B are not directly opposite of each other.
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4 replies | 110 view(s)
09-18-2017,
12:48 PM
Subhotosh Khan
replied to a thread
quadratic equation involving h(t): h(t) = -16t^2 + vt + s
in
Intermediate/Advanced Algebra
Above is an equation for parabola. What is the location of vertex?
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2 replies | 57 view(s)
09-18-2017,
10:04 AM
Subhotosh Khan
replied to a thread
Amar baked a cake. John ate 1/6 of the cake. Susan ate 1/5 of whats left....
in
Arithmetic
Do you see that everybody is eating 1/6 of the original cake! How? What are your thoughts? Please share your work with us ...even if you know...
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3 replies | 132 view(s)
09-17-2017,
07:57 PM
Subhotosh Khan
replied to a thread
Calculus 3 - Center of Mass of a Lamina (Polar Coordinates) - I need a better method?
in
Calculus
Factor 2 out then apply 1/2 angle formula (Θ = 2Φ).... see what you get.
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3 replies | 65 view(s)
09-17-2017,
07:51 PM
Subhotosh Khan
replied to a thread
Can only prove 2 out of 4 solutions...wouldnt mind be pointed in the right direction
in
Geometry and Trig
Welcome back ...... long time no hear (well may be "see" is more accurate)
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10 replies | 219 view(s)
09-17-2017,
04:33 PM
Subhotosh Khan
replied to a thread
Math puzzle: (X.6)(y.4) = 288, X^2-y^2 = -5, X.7-3.x = 19, (Y-x)/(x-y)= -1
in
Intermediate/Advanced Algebra
These equations are inconsistent - there is no solution to those in the domain of numbers.
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20 replies | 475 view(s)
09-17-2017,
04:20 PM
Subhotosh Khan
replied to a thread
Can only prove 2 out of 4 solutions...wouldnt mind be pointed in the right direction
in
Geometry and Trig
Here you had a restricted domain of 0≤x≤2π As mmm responded, there are infinite solutions. But there are 4 solutions within the given domain. As...
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10 replies | 219 view(s)
09-17-2017,
12:41 PM
Subhotosh Khan
replied to a thread
Can only prove 2 out of 4 solutions...wouldnt mind be pointed in the right direction
in
Geometry and Trig
.
see more
10 replies | 219 view(s)
09-17-2017,
08:17 AM
Subhotosh Khan
replied to a thread
Calculus: Proofs Help with homework: If a < 0, b < 0, then √ab ≤ −(a+b)/2
in
Calculus
What are your thoughts? Please share your work with us ...even if you know it is wrong. If you are stuck at the beginning tell us and we'll...
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2 replies | 142 view(s)
09-17-2017,
08:09 AM
Subhotosh Khan
replied to a thread
Math puzzle: (X.6)(y.4) = 288, X^2-y^2 = -5, X.7-3.x = 19, (Y-x)/(x-y)= -1
in
Intermediate/Advanced Algebra
Are x & X referring to the same number? Are y & Y referring to the same number?
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20 replies | 475 view(s)
09-16-2017,
07:27 PM
Subhotosh Khan
replied to a thread
Quick range question: find range of f(x)=(x-5)/X^2-5x+6
in
Intermediate/Advanced Algebra
y=(x-5)/(x^2-5x+6) y=(x-5)/(x^2 - 2x - 3x + 6) y=(x-5)/ Thus there are two vertical asymptotes at x = 2 & x = 3 continue....
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6 replies | 203 view(s)
09-16-2017,
07:19 PM
Subhotosh Khan
replied to a thread
Can someone help me prove that 3sec(x)^2-2=sec(x)^2+2tan(x)^2 ?
in
Geometry and Trig
In my opinion, a cleaner version would be: 3sec˛(x) - 2 = sec˛(x) + 2sec˛(x) - 2 = sec˛(x) + 2 = sec˛(x) + 2
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5 replies | 230 view(s)
09-16-2017,
09:39 AM
Subhotosh Khan
replied to a thread
Determining Derivative for f(x)=sin(x^3 / (cos(x^3)))
in
Calculus
Is your function: \displaystyle{sin\left } ........................ this is what you posted or \displaystyle{\dfrac{sin(x^3)}{cos(x^3)}} ...
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2 replies | 159 view(s)
09-16-2017,
09:28 AM
Subhotosh Khan
replied to a thread
need help factoring this polynomial: 2x^6 + 5x^4 - x^2
in
Intermediate/Advanced Algebra
Do you see any term common to all three? If you do, first action would be to factor that out. Now continue... If you are still stuck write...
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5 replies | 191 view(s)
09-15-2017,
06:37 PM
Subhotosh Khan
replied to a thread
stationary solution for u(x,t)=v(x,t)+h(x) for heat PDE with BC of U1
in
Differential Equations
at t = ∞ → u = h and v = 0
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5 replies | 330 view(s)
09-15-2017,
12:33 PM
Subhotosh Khan
replied to a thread
Crypt
in
Math Odds & Ends
Kha_a_a_an ...... William Shatner ..... Captain Kirk ????
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3 replies | 238 view(s)
09-15-2017,
12:27 PM
Subhotosh Khan
replied to a thread
Please help me solve this with a quick method: A milkman sells 81 liters of milk....
in
Arithmetic
What are your thoughts? Please share your work with us ...even if you know it is wrong. If you are stuck at the beginning tell us and we'll...
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3 replies | 183 view(s)
09-14-2017,
07:02 AM
Subhotosh Khan
replied to a thread
Newb needs assistance basic: (2y * 3x) + 2 = 7xy??
in
Beginning Algebra
That depends on what you exactly mean by combined! An expression like: x^3 + 3x^2*y + 3x*y^2 + y^3 can be written as (x + y)^3 and most of...
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6 replies | 430 view(s)
09-13-2017,
04:17 PM
Subhotosh Khan
replied to a thread
Singular Discussion
in
Math Odds & Ends
Sheeesh!! First I had to Google "tabarnak" - then I had to go wash my eyes with soap!! I used to say I could curse people out in 7 languages -...
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6 replies | 324 view(s)
09-13-2017,
07:27 AM
Subhotosh Khan
replied to a thread
Qustion aout a quadratic function: "...whose zero values are 11" ?
in
Intermediate/Advanced Algebra
The word value was in plural number! So both the values must be 11 → hence f(x) = (x-1)^2 I personally would call this a trick question!
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5 replies | 221 view(s)
09-13-2017,
07:24 AM
Subhotosh Khan
replied to a thread
sum of the series: sum [k=1, n] 2^{n-k} k^2
in
Intermediate/Advanced Algebra
Expand the (sum) series to n=1, and n=3 and n = 4 and n=5.... see any pattern?
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6 replies | 292 view(s)
09-12-2017,
06:03 PM
Subhotosh Khan
replied to a thread
Calculus II Riemann Sums Problem: cone and cake layers
in
Calculus
Let \mathcal{T} denote the triangle with vertices (0, 0), (R, 0), and (0, H). If we rotate \mathcal{T} about the y-axis, we will get a cone with...
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5 replies | 254 view(s)
09-12-2017,
10:17 AM
Subhotosh Khan
replied to a thread
Mathematical reasoning with Function: u^2 + v^2 = 2
in
Intermediate/Advanced Algebra
What is the problem?
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5 replies | 258 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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Last Activity
Today
03:57 PM
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06-18-2007
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