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Subhotosh Khan
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Subhotosh Khan
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Join Date
06-18-2007
Last Activity
Today
11:58 AM
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Today,
11:57 AM
Subhotosh Khan
replied to a thread
(3^x)-4*(3^-x)=0 Asking for some assistance.
in
Intermediate/Advanced Algebra
Assuming you need to solve for 'x': a) (3^x)-4*(3^-x)=0 substitute u = 3^x → u - 4/u = 0 → u^2 - 4 = 0 → solve for u → solve for 'x'
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3 replies | 34 view(s)
Today,
10:48 AM
Subhotosh Khan
replied to a thread
Circle intersections
in
Advanced Math
By that I assume you mean co-ordinates of the center. Have you drawn few sketches to investigate the problem? In particular draw a sketch where...
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1 replies | 26 view(s)
Today,
07:44 AM
Subhotosh Khan
replied to a thread
What is the probability of telling a secret.
in
Probability / Statistics
I have not seen a fair dice with five faces yet!
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4 replies | 105 view(s)
10-16-2017,
02:13 PM
Subhotosh Khan
replied to a thread
Q about roots of quadratic eqn: Given a, b, c are lengths of sides of triangle...
in
Intermediate/Advanced Algebra
Even proper French or Sanskrit will do .....
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17 replies | 470 view(s)
10-16-2017,
07:35 AM
Subhotosh Khan
replied to a thread
Function: For f(×) = ln(2x-1), find inverse function, including its domain and range
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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2 replies | 122 view(s)
10-15-2017,
06:14 PM
Subhotosh Khan
replied to a thread
Q about roots of quadratic eqn: Given a, b, c are lengths of sides of triangle...
in
Intermediate/Advanced Algebra
It is actually much simpler than that: a^2 - b^2 + c^2 - 2ac < 0 (a-c)^2 - b^2 Since a, b & c are sides of an Euclidian triangle - the...
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17 replies | 470 view(s)
10-15-2017,
12:07 PM
Subhotosh Khan
replied to a thread
Q about roots of quadratic eqn: Given a, b, c are lengths of sides of triangle...
in
Intermediate/Advanced Algebra
Well ... we.....I do not work through third party very well.... Hint: use difference of squares formula...
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17 replies | 470 view(s)
10-15-2017,
10:46 AM
Subhotosh Khan
replied to a thread
Fraction: simplify [(1-x)/x] * [ {(x-1)/(sqrt[x]+1)} /1]
in
Intermediate/Advanced Algebra
\frac{1-x}{x}*\frac{(x-1)(\frac{1}{\sqrt{x}+1})}{1} ← this does NOT come from the given problem. Instead it should have been: ...
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7 replies | 259 view(s)
10-15-2017,
10:33 AM
Subhotosh Khan
replied to a thread
How would I evaluate functions, derivatives, given table of values?
in
Calculus
How would you express (fg)'(x)? Using product rule I get: (fg)'(x) = f(x) * g'(x) + f'(x) * g(x) (fg)'(-2) = f(-2) * g'(-2) + f'(-2) * g(-2) =...
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1 replies | 101 view(s)
10-15-2017,
10:21 AM
Subhotosh Khan
replied to a thread
Need help w/: If A/B = 2/3, B/C = 4/7, find the value of A/C.
in
Beginning Algebra
From A/B = 2/3, write A as a function of B → A = 2/3 * B ..........................(1) From B/C = 4/7, write C as a function of B → ??...
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4 replies | 204 view(s)
10-15-2017,
10:14 AM
Subhotosh Khan
replied to a thread
Q about roots of quadratic eqn: Given a, b, c are lengths of sides of triangle...
in
Intermediate/Advanced Algebra
Why is your friend asking you this question - and you to us? Please let him/her ask the question directly - including some work
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17 replies | 470 view(s)
10-14-2017,
12:01 PM
Subhotosh Khan
replied to a thread
Please enlighten us! (splitting the bills related to a wedding)
in
Arithmetic
Since your wife is getting the wedding dress - you should get (1700.50/2 =) $850.25 from your wife - and you will be .... well not so fine .....
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3 replies | 230 view(s)
10-13-2017,
04:59 PM
Subhotosh Khan
started a thread
Wonderings of a foreign born.....
in
Math Odds & Ends
- Wonder why the word funeral starts with FUN? -Why isn't a Fireman called a Water-man? - How come Lipstick doesn't do what it says? - If...
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2 replies | 181 view(s)
10-13-2017,
12:03 PM
Subhotosh Khan
replied to a thread
Difficulty in Exponential-solving for "X"
in
Intermediate/Advanced Algebra
Since you have a "power" function - you will need to use logarithm. Are you familiar with that operation? If not, start googling "power...
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12 replies | 411 view(s)
10-13-2017,
11:58 AM
Subhotosh Khan
replied to a thread
Company Survey: how to weight multiple units?
in
Probability / Statistics
That is not correct. → 20 x 100 + 80 = 2080
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2 replies | 95 view(s)
10-11-2017,
11:24 AM
Subhotosh Khan
replied to a thread
Finding the vertical and horizontal tangents to the polar curve r=θ?
in
Calculus
Sin(Θ) + Θ*cos(Θ) = 0 cannot be solved (for Θ) by known algebraic manipulations. Using numerical method the (approximate) solutions are: Θ...
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3 replies | 192 view(s)
10-09-2017,
07:39 AM
Subhotosh Khan
replied to a thread
How do I solve this Circle Tangent Problem?
in
Geometry and Trig
Your image is too small and fuzzy - cannot decipher.
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5 replies | 278 view(s)
10-08-2017,
06:04 PM
Subhotosh Khan
replied to a thread
Limit of (1/n)*((x+a/n)^2+(x+2a/n)^2+...+(x+(n-1)a/n)^2) as n -> infinity
in
Calculus
What do you get when you differentiate your new series?
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1 replies | 88 view(s)
10-07-2017,
05:50 PM
Subhotosh Khan
replied to a thread
Limit of sin(2^n) as n-> inifinity
in
Calculus
How would you calculate: \displaystyle{\lim_{x \to \infty} \sin(x)}
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5 replies | 304 view(s)
10-07-2017,
05:24 PM
Subhotosh Khan
replied to a thread
Limit of sin(2^n) as n-> inifinity
in
Calculus
|sin(2^n)| ≤ 1
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5 replies | 304 view(s)
10-07-2017,
01:05 PM
Subhotosh Khan
replied to a thread
Limit of sin(2^n) as n-> inifinity
in
Calculus
Why that is not acceptable? How do you calculate limit of an oscillating function?
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5 replies | 304 view(s)
10-07-2017,
10:14 AM
Subhotosh Khan
replied to a thread
Higher Order Differential Equation: (D^3 + 1) y = cos^2(x/2) + e^{-x}
in
Differential Equations
Hint: cos2(x/2) = (1/2)*cos(x) + (1/2)
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1 replies | 374 view(s)
10-07-2017,
09:13 AM
Subhotosh Khan
replied to a thread
Solve T = x + y + z, z = 5000, y = 15000, x = 0.60 * T for T
in
Beginning Algebra
Using (1): T = 0,60 * T + 15000 + 5000 T - 0,60 * T = 15000 + 5000 continue....
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14 replies | 943 view(s)
10-07-2017,
09:06 AM
Subhotosh Khan
replied to a thread
Find the profit: "Rajendra and Rehana own a business...."
in
Finance/Business Math
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 | 228 view(s)
10-07-2017,
09:04 AM
Subhotosh Khan
replied to a thread
Probs w/ logs: (1/4)^{log_4(1/3)}, log_{0,2}(0,3) - log_{0,2}(0,5) - log_{0,2}(15)
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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3 replies | 207 view(s)
10-07-2017,
09:03 AM
Subhotosh Khan
replied to a thread
Find angles of triangle if AB+AD=CD and AC+AD=BC (very hard for me)
in
Geometry and Trig
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 | 216 view(s)
10-06-2017,
08:22 AM
Subhotosh Khan
replied to a thread
Problem:Calculus: Find derivative of [x (x+1) (x+2) (x+3)]^(1/3)
in
Calculus
If I were to do this problem I would start it this way: d/dx{ x(x+1)(x+2)(x+3)](1/3)} =d/dx{ (1/3)] * (1/3)} = (1/3)] *...
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2 replies | 184 view(s)
10-06-2017,
07:59 AM
Subhotosh Khan
replied to a thread
Average Rate Of Change of g(x) = −2x^2 − 2x + 5 over [-2, 3]
in
Calculus
What is the definition of average rate of change of a function within a given interval(x1,x2)?
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2 replies | 191 view(s)
10-06-2017,
07:55 AM
Subhotosh Khan
replied to a thread
Please help with this question relating to inverse functions
in
Calculus
Is there a functional relationship between "M" and "m"?
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2 replies | 169 view(s)
10-05-2017,
03:29 PM
Subhotosh Khan
replied to a thread
Permutations + geometric progression (payout on a gambling machine)
in
Probability / Statistics
The number formed will be 12345? → Why not 54321? What are your thoughts? Please share your work with us ...even if you know it is wrong. ...
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2 replies | 189 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
11:58 AM
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06-18-2007
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