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Older Activity
Today,
12:26 PM
Denis
replied to a thread
Expanding and Simplifying with Fractions
in
Beginning Algebra
This can be "simplified" further to (8x + 9) / 15
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4 replies | 72 view(s)
Today,
12:12 PM
sinx
replied to a thread
Expanding and Simplifying with Fractions
in
Beginning Algebra
don't let the symbols confuse you. with an expression such as 1/5(x+3) each term inside the paranthesis is multiplied by 1/5. This yields x/5 +...
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4 replies | 72 view(s)
Today,
11:40 AM
MarkFL
replied to a thread
Optimisation question #2
in
Calculus
Okay, let's first look at: r=\sqrt{(R-x)^2+y^2} If we expand the radicand, then we have: r=\sqrt{R^2-2Rx+x^2+y^2} Now, we know...
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10 replies | 128 view(s)
Today,
11:13 AM
Subhotosh Khan
replied to a thread
Using the Squeeze Theorem, but how?
in
Calculus
because e^x ≥ 0 → sin(e^x) ~ sin(1) > 0
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6 replies | 55 view(s)
Today,
10:57 AM
winod
replied to a thread
Optimisation question #2
in
Calculus
Hello, r=\sqrt{(R-x)^2+y^2} and \theta=\arcsin\frac{y}{r}
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10 replies | 128 view(s)
Today,
10:50 AM
Dr.Peterson
replied to a thread
Numerals 1 2 3 4 5 6 7 8 9 arranged as a fraction that equals 1/3
in
Intermediate/Advanced Algebra
I've seen this problem before, given to students at this level, probably intended to be solved by orderly trial and error, with a little intelligence...
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5 replies | 94 view(s)
Today,
10:22 AM
JeffM
replied to a thread
Make x the subject of √(x - a) + b = 1/c
in
Intermediate/Advanced Algebra
\sqrt{x - a} + b = \dfrac{1}{c} \implies \sqrt{x - a} = \implies \dfrac{1}{c} - b \implies x - a = \left ( \dfrac{1}{c} - b \right )^2 \implies x...
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10 replies | 84 view(s)
Today,
10:07 AM
Dr.Peterson
replied to a thread
Make x the subject of √(x - a) + b = 1/c
in
Intermediate/Advanced Algebra
You're asking for help expanding (1/c - b)^2 + a? It would be more helpful if you had shown your attempt, so we could see HOW you are stuck. There...
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10 replies | 84 view(s)
Today,
09:52 AM
lev888
replied to a thread
Using the Squeeze Theorem, but how?
in
Calculus
Why is sin(e^x)>0? If x is close to 0?
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6 replies | 55 view(s)
Today,
09:09 AM
mmm4444bot
replied to a thread
Dull crypt
in
Math Odds & Ends
God save the queen It'll make for more homophone clues, using grouse growls and such. ;)
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7 replies | 81 view(s)
Today,
09:08 AM
Phavonic
replied to a thread
Make x the subject of √(x - a) + b = 1/c
in
Intermediate/Advanced Algebra
OK, thanks. So it only leaves me to ask someone to help me with the rest of the workings out. I originally got stuck at (1/c - b)^2 + a, before...
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10 replies | 84 view(s)
Today,
09:03 AM
Dr.Peterson
replied to a thread
Multi-Variable chain rule
in
Calculus
I can't quite read your image. One way to ensure that an image has the appropriate resolution is to display your original on your computer and use...
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2 replies | 30 view(s)
Today,
08:58 AM
JeffM
replied to a thread
Multi-Variable chain rule
in
Calculus
I can't see the image. Furthermore, if x and y are functions of n, and z is a function of x and y, then z is just a function of n. What is...
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2 replies | 30 view(s)
Today,
08:47 AM
Denis
replied to a thread
Dull crypt
in
Math Odds & Ends
Yep: thick "kinda sounds like" tick. "Homophone" clues are pretty "loose in the caboose!". I've seen oust = house!! You no agree??
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7 replies | 81 view(s)
Today,
08:46 AM
Dr.Peterson
replied to a thread
Solve for x or y with a given angle
in
Geometry and Trig
Can you explain more about why you are doing this? I don't understand where A and B fit in; and if you changed some signs, you would be rotating by...
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2 replies | 68 view(s)
Today,
08:41 AM
Subhotosh Khan
replied to a thread
Using the Squeeze Theorem, but how?
in
Calculus
Also use the fact that e^x is always ≥ 0 → sin(e^x)>0 → ≤3
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6 replies | 55 view(s)
Today,
08:41 AM
MarkFL
replied to a thread
Optimisation question #2
in
Calculus
Because of symmetry, we can simply maximize s. What I did was let the point above the x-axis where the two circles intersect be (x,y). We know: ...
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10 replies | 128 view(s)
Today,
06:59 AM
HallsofIvy
replied to a thread
Using the Squeeze Theorem, but how?
in
Calculus
You might use the fact that sine is always between -1 and 1.
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6 replies | 55 view(s)
Today,
06:32 AM
Phatfoo
replied to a thread
Using the Squeeze Theorem, but how?
in
Calculus
Okay, so how do I "come up with" two functions that do that? Do I first need to simplify the current equation?
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6 replies | 55 view(s)
Today,
06:22 AM
lev888
replied to a thread
Using the Squeeze Theorem, but how?
in
Calculus
First of all, there are no equations here. You need to come up with two functions that squeeze the given function and have the same limit. This...
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6 replies | 55 view(s)
Today,
05:58 AM
mmm4444bot
replied to a thread
Need help writing a universal equation involving time and stepping rates.
in
Finance/Business Math
Yes, they can be. :) I'm wondering how strict the cutoff times are. If I plan to check out before 11:00am to avoid the extra $7 after 11am, but...
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8 replies | 233 view(s)
Today,
05:19 AM
mmm4444bot
replied to a thread
Vector addition (triangle law)
in
Geometry and Trig
The verb "to subtend" has a technical meaning, but here Mark simply meant the angle between the two sides. We use the Law of Cosines when we know...
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9 replies | 117 view(s)
Today,
04:21 AM
calvingloster
started a thread
Multi-Variable chain rule
in
Calculus
Hi All New to the forum. I am in the process of learning about backpropagation for use in AI. My maths is very rusty and i am stuck at...
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2 replies | 30 view(s)
Today,
03:28 AM
mmm4444bot
replied to a thread
Optimisation question #1
in
Calculus
The derivative is not correct. I made a mistake in my notation, mixing up P(r) and P(x). We're using P(x) to find the minimum perimeter, as a...
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11 replies | 213 view(s)
Today,
02:54 AM
Indranil
replied to a thread
Vector addition (triangle law)
in
Geometry and Trig
If you don't mind, could you please explain what 'the angle subtended by the two known sides' means?
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9 replies | 117 view(s)
Today,
02:22 AM
winod
replied to a thread
Optimisation question #1
in
Calculus
Hello, So i computed 1st derivative \frac{4sin^2(x)+2cos^2(x)+4sin(x)}{sin(x)cos(x)}. Putting P'(r)=0 we get (1+sin^2 (x))=-2sin(x). Now what to do?
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11 replies | 213 view(s)
Today,
02:13 AM
Phatfoo
started a thread
Using the Squeeze Theorem, but how?
in
Calculus
I have been stuck on this for 2 days. All examples that I've done use multiple equations (since something is being "squeezed"). I have no idea...
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6 replies | 55 view(s)
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