A simple math sum.

Dave said:
2+4 is 1 if you are in mod 5, not mod 4 :p
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Oh bugger, I was being an idiot and counting from zero with 2.

Haven't done modulo arithmetic in a couple of years to be fair!

Some simultaneous equations:

(3x^2)+(2y^4)+z=0
(4x^(1/2))+(3iy^e)+4sinz=23
((4cos2x)/(3cos3x))+4y+(z^2x)=14

Solve!

And good luck :)

Edit: without Wolfram Alpha if you can :) I'm expected to solve this sort of stuff at degree level, it's an example from monday's lecture :)
 
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Excel says 7...

zubk2.png
 
Shayper said:
Oh bugger, I was being an idiot and counting from zero with 2.

Haven't done modulo arithmetic in a couple of years to be fair!

Some simultaneous equations:

(3x^2)+(2y^4)+z=0
(4x^(1/2))+(3iy^e)+4sinz=23
((4cos2x)/(3cos3x))+4y+(z^2x)=14

Solve!

And good luck :)

Edit: without Wolfram Alpha if you can :) I'm expected to solve this sort of stuff at degree level, it's an example from monday's lecture :)
Click to expand...

With all due respect, I am someone who spends all day formulating and solving complex partial differential equations, which involves the numerical solution of millions of simultaneous equations. (I think Duff-Man on here is also someone who develops finite-element / finite-volume codes) I therefore don't feel too enamoured towards solving some simple sets of equations in my spare time - if I wanted to do this then I'd sit in the college admissions again for maths / engineering / physics undergrads and watch candidates try not to mess them up :p

Once you're not an undergrad / high school student any more then you don't need to prove to yourself you can do it, you fire up Mathematica and get the computer to solve it in a couple of seconds rather than wasting your own time! You reach that stage where simple maths starts to seem complicated again - I had to do a couple of numerical tests for job applications, and I was in that awkward situation of not wanting to mess up currency conversion questions / percentage increases by deeming it below me :p
 
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Well done OP. Somebody posted this on Facebook I guess with the intention of causing trouble. Sorry to dampen your spirit but this has been done to death already here

- GP
 
Dave said:
With all due respect, I am someone who spends all day formulating and solving complex partial differential equations, which involves the numerical solution of millions of simultaneous equations. (I think Duff-Man on here is also someone who develops finite-element / finite-volume codes) I therefore don't feel too enamoured towards solving some simple sets of equations in my spare time - if I wanted to do this then I'd sit in the college admissions again for maths / engineering / physics undergrads and watch candidates try not to mess them up :p

Once you're not an undergrad / high school student any more then you don't need to prove to yourself you can do it, you fire up Mathematica and get the computer to solve it in a couple of seconds rather than wasting your own time! You reach that stage where simple maths starts to seem complicated again - I had to do a couple of numerical tests for job applications, and I was in that awkward situation of not wanting to mess up currency conversion questions / percentage increases by deeming it below me :p
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:)

That's fair enough :)

It was more directed at anyone else who's up for it :)
 
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