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The Math Game :D
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| ODST |
Posted on 08/16/2013 17:46:33
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Ok, this one is simple. Person puts up math problem to solve. The person who gets it right puts up the next problem etc. I shall start. AND SHOW ALL DE WORK  !
4-4
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| rawr |
Posted on 08/16/2013 17:54:47
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Wanker
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4-4=0
9x9=?
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| Dudeman |
Posted on 08/16/2013 18:01:00
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9x9=81
∫sin(4x)dx
I guess it doesn't show up, the integral of sin(4x)dx from 0 to 1
Edited by Dudeman on 08/16/2013 18:02:50
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| Revenge |
Posted on 08/16/2013 18:07:51
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You really ought to post things that are easily do-able, Dudeman. The idea of a thread for games is that its fun and quick to use.
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| Dudeman |
Posted on 08/16/2013 18:14:26
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This is easy  but okay...100÷25=?
btw in my other problem
integral of sinx is -cosx
u=4x
du=4dx rewrite du/4=dx
rewrite equation 1/4intsin(u) from 0 to 4
Answer:-1/4(cos(4)-cos(0)) = -1/4(cos(4)-1) That would have been viable or you could type that into a calculator and see what that spits out 
Edited by Dudeman on 08/16/2013 18:26:20
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| Revenge |
Posted on 08/16/2013 18:37:10
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It may be for you, but I think Odis is going for something a little easier than that. He has the final word.
100/25=4
15=5X
What is X?
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| Vulture |
Posted on 08/16/2013 18:48:23
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Edit: Damn, Revenge beat me to the post.
But his X = 3
Mine:
1 + 3 + 3 = ?
Edited by Vulture on 08/16/2013 18:49:31
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| Dudeman |
Posted on 08/16/2013 18:55:11
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1+3+3=7
Where does the line on this graph cross the y axis?
Edited by Dudeman on 08/16/2013 18:55:42
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| Revenge |
Posted on 08/16/2013 19:12:39
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Y=4, or (0,4).
If X=-2, what does -3(x)+3(x) equal?
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| Dudeman |
Posted on 08/16/2013 19:23:33
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If X=-2, what does -3(x)+3(x) equal?
-3(-2)+3(-2)=
6+-6=
6-6=
0
or x(-3+3)
-2(0)
0
Problem y=5x+4 What is the slope of this line?
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| BuhBiggieback |
Posted on 08/16/2013 19:35:28
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Wanker
Posts: 582
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Just thought I'd stick my head in
Slope is five the number the variable = slope no work needed
In a certain country ½ of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10 ?
Love me some math.
Edited by BuhBiggieback on 08/16/2013 19:35:52 |
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| Dudeman |
Posted on 08/16/2013 19:59:21
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BuhBiggieback wrote:
Just thought I'd stick my head in
Slope is five the number the variable = slope no work needed
In a certain country ½ of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10 ?
Love me some math.
You rounded up from 2.5 to 3 meaning that the country doesn't have decimals only whole numbers so 1/3 of 10=3.33
Now this could go one of two ways. This country could say if you have 3.33 of something that must be 4 since you already have 3 and 1/3...Or this country would round down to 3 (Which I guess would be my final answer)
How can you add eight eights to get the number one thousand?
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| ODST |
Posted on 08/16/2013 22:40:04
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so 8+8 = 16
multiply that by 8 and you get 128
(8+8)/8 = 2
128-2 = 126
126 x 8 = 1008
1008 - 8 = 1000
;D
the integral of ((tan^4 x sec x dx)
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| Dudeman |
Posted on 08/16/2013 23:37:18
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ODST wrote:
so 8+8 = 16
multiply that by 8 and you get 128
(8+8)/8 = 2
128-2 = 126
126 x 8 = 1008
1008 - 8 = 1000
;D
the integral of ((tan^4 x sec x dx)
It was 888 + 88 + 8 +8 +8 = 1,000 but close enough
Your question is confusing to me. Did you mean (tan(x^4))secxdx) or (((tanx)^4)(secx)dx)? Believe me these will bring back completely different results and have to be handled differently
Sincerely,
Dudelyman
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| ODST |
Posted on 08/17/2013 10:59:09
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the 2nd one, dont worry i understand i tried to write it clearly its (((tanx)^4)(secx)dx)?
i had to do that on the test it was nasty.... ;D
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| ninja |
Posted on 08/17/2013 12:35:14
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How fun, what a great thread!
ODST wrote:
the 2nd one, dont worry i understand i tried to write it clearly its (((tanx)^4)(secx)dx)?
i had to do that on the test it was nasty.... ;D
That looks very hard to me: had a quick go on paper and couldn't do it! I'll be interested to see your method.
My brain is open.
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| Revenge |
Posted on 08/17/2013 13:56:41
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Mathematics are great.
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| ODST |
Posted on 08/17/2013 15:27:59
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lol it was for de extra credet i got it mostly right i had a tan i shouldn't have had. memorized something wrong lol.
er lets see if i can read my handwriting.
First off use integration of parts. The variables for it ;D
let u = (tan x)^3
du= 3 (tan x)^2 (sec x)^2 dx
dv = sec x tan x dx
v = sec x
so
uv - the integral of v du
so that is
(tan x)^3 (sec x) - integral of (sec x)^3 (tan x)^2 dx
(sec x) (sec x)^2 (tan x) ^2
(sec x)^2 = 1+ (tan x) ^2
now from trig, you learned trig identity's which are very useful right now. let .
so now its (tan x)^3 (sec x) - integral of (sec x) (1+(tan x)^2) (tan x) ^2 dx
now that its like that by carrying out the multiplication you can break this into two separate integrals.
(tan x)^3 (sec x) - integral of (sec x) (tan x) ^2 dx - the integral of (sec x) (tan x) ^ 4 dx
Oh looky, that last integral is = to what WE ORIGINALLY HAD!
since this is all equal to the integral of (tan x)^4 sec x dx
add the integral of (sec x) (tan x) ^ 4 dx to both sides.
2 times de integral of sec x (tan x)^4 dx = (tan x)^3 sec x - the integral of sec x (tan x) ^ 2.
(tan x) ^2 = (sec x)^2 - 1
again those trig identity's come in handy.
dividing both sides by 2 to get it
integral of sec x (tan x)^4 dx = ((tan x)^3 sec x - the integral of (sec x)^3 dx - the integral of sec x dx) /2
now to integrate.
the integral of (sec x)^3 dx = a very long nasty integration by parts. Our professor saved us this trouble by having us memorize what this equals. = (sec x tan x + ln l sec x + tan x l)/2
integral of sec x = ln l sec + tan x l
so the final answer was 1/2( (tan x)^3 sec x - 1/2(sec x tan x + ln l sec x + tan x l) - ln l sec + tan x l = the integral of (((tanx)^4)(secx)dx).
he gave me 8 of 10 on that. I think i might have missed de 3 somewhere. this is close enough to de answer .
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| ODST |
Posted on 08/17/2013 15:43:23
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Revenge wrote:
It may be for you, but I think Odis is going for something a little easier than that. He has the final word.
100/25=4
15=5X
What is X?
nah i thought id start it out easy but anything goes ITS MATH LONG LIVE MATH :
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| Dudeman |
Posted on 08/17/2013 16:16:35
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I thought it was integration by parts, it was that I forgot to separate one of the tan x's out. Isn't integration by parts udv - integral of vdu? it's been a long time 
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