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brotherbobby's latest activity
brotherbobby
reacted to
PeroK's post
in the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
with
Like
.
I think the binomial method is quite general and easy to remember: $$x^2 + y^2 = \frac 1 2(a^2 + b^2)$$$$x^4 + y^4 = \frac 1 8(a^4 +...
Yesterday, 2:48 PM
brotherbobby
replied to the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
.
Jujitsu you mean. 😝 Yes there's an element of intelligence about the method. Nonetheless, asked some different and more complicated...
Yesterday, 12:39 PM
brotherbobby
replied to the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
.
@PeroK's observations (post #13) can be extended to even powers also - how would, for example, ##x^4+y^4## look? [Given ##x+y=m,\...
Yesterday, 11:59 AM
brotherbobby
replied to the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
.
Yes I understand. I must admit that I have often had the urge to come on here for problems which proved difficult after a few attempts...
Monday, 5:38 PM
brotherbobby
replied to the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
.
Yes, I suppose it's a mistake to come on here too soon.
Monday, 4:36 PM
brotherbobby
replied to the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
.
Thanks. Corrected.
Monday, 2:00 PM
brotherbobby
replied to the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
.
Aha I remember ##(x+y)^2-(x-y)^2=4xy\Rightarrow xy = \dfrac{1}{4}\{(x+y)^2-(x-y)^2\}##. Worth trying (2nd method above)...
Monday, 1:59 PM
brotherbobby
posted the thread
Express ##x^3+y^3## in terms of ##m## and ##n##
in
Precalculus Mathematics Homework Help
.
Let me start by showing the problem as it appeared in the text. Attempt : ##{\color{red}{\large *}}## The key thing is to do the...
Monday, 1:25 PM
brotherbobby
replied to the thread
Projectile Motion Problem Involving Initial Velocity and Gravity Only
.
Ok so the horizontal distance from the point of projection to the point of landing is 20m?
Apr 27, 2024
brotherbobby
replied to the thread
Two tourists and a bicycle - uniform motion
.
Yes. Which means if A cycles a distance ##d## greater than he walks, B has to walk the distance ##d## greater than he gets to cycle and...
Apr 26, 2024
brotherbobby
replied to the thread
Projectile Motion Problem Involving Initial Velocity and Gravity Only
.
In your problem statement, you wrote "The flight distance D = 20m". What distance is this? The horizontal distance or vertical? Or is...
Apr 26, 2024
brotherbobby
replied to the thread
Two tourists and a bicycle - uniform motion
.
Yes I had already written out the solution in post#14, even though I had conceptual doubts.
Apr 26, 2024
brotherbobby
replied to the thread
Two tourists and a bicycle - uniform motion
.
Brilliant. I was about to do it myself but thanks a lot. It was a tricky problem and I have clarified my doubts.
Apr 25, 2024
brotherbobby
replied to the thread
Two tourists and a bicycle - uniform motion
.
I have drawn the distance time graph of the problem below for tourists A and B, and the cycle C. But it hasn't helped me in my solution...
Apr 23, 2024
brotherbobby
replied to the thread
Two tourists and a bicycle - uniform motion
.
Thank you all for your comments and apologies for the almost 24 hour delay in my reply. For now @haruspex 's method seems the most...
Apr 23, 2024
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