ihatemaths

60 Reputation

2 Badges

16 years, 332 days

MaplePrimes Activity


These are answers submitted by ihatemaths

Does anybody know why this is going wrong? > restart: > U:={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45}; U := {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45} > A:={1,12,25,30,32,34,39}; A := {1, 12, 25, 30, 32, 34, 39} > B:={3,6,9,12,15,18,21,24,27,30,33,36,39,42,45}; B := {3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45} > C:={6,12,18,24,30,36,42}; C := {6, 12, 18, 24, 30, 36, 42} > U minus (C minus B); {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45}
I think i'm getting this all wrong! I have a universal set of: {x:<=x<=45} The set A is {1,12,25,30,32,34,39} The set B is{x:x is exactly divisible by 3} The set C is {x:x is exactly divisible by 6} Now, although I can't remember how I got the answer, I have an answer of {1,25,32,34} On Maple I have this: > U minus (C minus B); {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45} It's not looking good is it? haha
Hi again, solve({y=2*x-5,y=2*x^2+2*x-21},{x,y}); Answer: {x = 2*RootOf(-2+_Z^2, label = _L8), y = 4*RootOf(-2+_Z^2, label = _L8)-5} evalf(%); {x = 3.722891566, y = -.7951807229}
Hi, Yes I typed in 2*x^2 (without the brackets of course)
Lovely, it works Thanks.
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