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/sci/ - Science & Math

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Anonymous Mon Jan 24 17:11:38 2011 No.2406078 [Reply] [Original]

Haven't done math in years. Help?

>>	Anonymous Mon Jan 24 17:13:38 2011 No.2406088 >>2406085 Oops. 2x = 36 x = 18

>>	Anonymous Mon Jan 24 17:13:38 2011 No.2406085 2x + 5 = 41 2x = 46 x = 23

>>	Anonymous Mon Jan 24 17:14:38 2011 No.2406095 >>2406085 It's 2x squared

>>	Anonymous Mon Jan 24 17:14:38 2011 No.2406096 >>2406085 >>2406088 There's a square in there, bro.

>>	Anonymous Mon Jan 24 17:14:56 2011 No.2406093 2x^2=41-5 2x^2=36 x^2=18 x=6

>>	Anonymous Mon Jan 24 17:15:38 2011 No.2406098 >>2406088 Shit, now I see the squared. 2x^2 = 46 x^2 = 23 x = +/- sqrt 23

>>	Anonymous Mon Jan 24 17:15:38 2011 No.2406104 >>2406093 ...seriously?

>>	Anonymous Mon Jan 24 17:16:38 2011 No.2406105 ~4.35889894 the other person forgot the exponent

>>	Anonymous Mon Jan 24 17:16:38 2011 No.2406107 2x^2+5=41 2x^2=36 x^2=18 x= +/- 3sqrt(2)

>>	Anonymous Mon Jan 24 17:17:38 2011 No.2406111 Forget everything I previously said, x=9

>>	Anonymous Mon Jan 24 17:17:38 2011 No.2406117 >>2406085 >>2406088 >>2406093 >>2406098 wat

>>	Anonymous Mon Jan 24 17:18:38 2011 No.2406119 >>2406111 Or even +/- sqrt 18.

>>	Anonymous Mon Jan 24 17:18:38 2011 No.2406120 >>2406104 derp I meant 4.24264069

>>	Anonymous Mon Jan 24 17:18:38 2011 No.2406121 >>2406098 Change side change sign dude.. They not teach you that in high school?

>>	Anonymous Mon Jan 24 17:19:38 2011 No.2406124 Since this board went to shit, my basic arithmetic has been poorer than usual. And that's bad. Yes, I'm gonna blame others for this one.

>>	Anonymous Mon Jan 24 17:20:38 2011 No.2406129 2x^2+5=41 2x^2+1002 x=9001

>>	Anonymous Mon Jan 24 17:20:38 2011 No.2406130 >>2406121 They didn't teach me any maths in highschool. Too much of a reprobate, I'm afraid.

>>	Anonymous Mon Jan 24 17:20:38 2011 No.2406133 this thread is pretty derp

>>	Anonymous Mon Jan 24 17:24:38 2011 No.2406146 >17 posts to answer this question Seriously /sci/?

>>	Anonymous Mon Jan 24 17:26:38 2011 No.2406151 ITT engineers and philosophy majors doing homework

>>	Anonymous Mon Jan 24 17:27:38 2011 No.2406153 File: 14 KB, 266x394, 1295842249859.jpg [View same] [iqdb] [saucenao] [google]

Anonymous Mon Jan 24 17:31:38 2011 No.2406164
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>>2406078
I'm sorry man, I don't mean to be a dick, I don't want to insult your intelligence, I'm sure you're a respectable man/woman, and I don't doubt your capability in anything that you put your mind to.

but >mfw simple algebra

>>	Anonymous Mon Jan 24 17:32:38 2011 No.2406169 2x^2 + 5 = 41 2x^2 = 36 x^2 = 18 x = +/- 3(2)^1/2 >>2406107 This guy's correct. >>2406119 No. Because, no. You have to break it down. You can't leave it as sqrt(18).

>>	Anonymous Mon Jan 24 17:35:38 2011 No.2406180 >>2406169 Nobody outside of highschool gives a shit about "simplest radical form." That said, OP is in highschool, so he should care.

>>	Anonymous Mon Jan 24 17:35:38 2011 No.2406181 File: 6 KB, 180x191, 1293568084604.jpg [View same] [iqdb] [saucenao] [google] >mfw middle school kids on /sci/

>>	Anonymous Mon Jan 24 17:38:38 2011 No.2406190 File: 39 KB, 958x660, math2.png [View same] [iqdb] [saucenao] [google] >>2406078

Anonymous Mon Jan 24 17:39:38 2011 No.2406194

>>2406190
oh fucking tit nuggets, I forgot about plus or minus.

You have to put that in front of any radical that you solve for, in this case when you take the square root of x^2 = 18. Since both negative square root of 18 and positive square root of 18 get you 18 if you square either of them.

>>	Anonymous Mon Jan 24 17:43:38 2011 No.2406204 This thread seriously made me lose all hope in /sci/ I could do this in my head to get 4.2, but most of you can't even do basic order of operations

Anonymous Mon Jan 24 17:44:38 2011 No.2406207

>>2406194
also really, the plus or minus doesn't matter unless you've got some kind of extension to the problem, like if the equation were, instead of = 41, = y. Then it would be a function. If someone said "this is the function of number of potato chips devoured by a neckbeard over time, find the time at which the neckbeard has devoured 41 potato chips" You would solve it in the exact same manner, except you would disregard the negative square root of 18 because that would be an erroneous answer, as a negative time doesn't make any sense when you assume that the origin is the start of the event.

>>	Anonymous Mon Jan 24 17:44:38 2011 No.2406209 >>2406204 hey bro, it's not like you have to pass a test to post on this board

>>	Anonymous Mon Jan 24 17:45:38 2011 No.2406213 File: 28 KB, 864x609, 1295846636924.jpg [View same] [iqdb] [saucenao] [google] Try this on for size

>>	Anonymous Mon Jan 24 17:47:38 2011 No.2406224 I pleased that you have such a vast intelligence. How about a meaningful contribution?

>>	Anonymous Mon Jan 24 17:51:38 2011 No.2406242 2x^(2)-36=0 2(x^(2)-18)=0 x= 18^(1/2) x=3(2^(1/2))

Anonymous Mon Jan 24 17:51:38 2011 No.2406244

>>2406180

>Nobody outside of highschool gives a shit about "simplest radical form." That said, OP is in highschool, so he should care.

The fuck? Where the fuck do you go? ASU?

That's bullshit. Even in the higher-end courses, it's expected that you break that shit down. Just because you were able to pass Algebra 1 & 2 doesn't mean you forget the fundamentals.

>>	Anonymous Mon Jan 24 17:52:38 2011 No.2406247 >>2406213 Thats neither Eulerian or Semi-Eulerian

>>	Anonymous Mon Jan 24 17:53:38 2011 No.2406253 2x^2+5=41 -5 2x^2=36 2x=6

>>	Anonymous Mon Jan 24 17:55:38 2011 No.2406259 File: 42 KB, 640x480, 1266122330672.jpg [View same] [iqdb] [saucenao] [google] >>2406253

>>	Anonymous Mon Jan 24 17:56:38 2011 No.2406272 File: 31 KB, 526x300, look.jpg [View same] [iqdb] [saucenao] [google] >>2406253

>>	Anonymous Mon Jan 24 17:58:38 2011 No.2406278 >>2406244 But in the real world (i.e. the 99.99% of people who aren't mathematicians), surd forms are fucking useless. People like decimals.

>>	Anonymous Mon Jan 24 18:02:38 2011 No.2406298 This is why we need new janitors, stat.

>>	Anonymous Mon Jan 24 18:04:38 2011 No.2406308 x=4

>>	Anonymous Mon Jan 24 18:09:38 2011 No.2406333 2x^2 + 5 = 41 2x^2 = 41 - 5 2x^2 = 36 x^2 = 18 x = +/- 3sqrt(2)

>>	Anonymous Mon Jan 24 18:09:38 2011 No.2406336 2x²+5=41 \| -5 2x² =36 \| /2 x² =18 \| √ x =+- 4.242640687119285 pew pew

>>	Anonymous Mon Jan 24 18:14:38 2011 No.2406363 I honestly can't tell if you guys are trolling or are serious.

>>	Anonymous Mon Jan 24 18:15:38 2011 No.2406369 >>2406333 >>2406336 Why do you faggots keep answering this?

>>	Anonymous Mon Jan 24 18:20:38 2011 No.2406407 So /sci/, for the love of god. What do you do first? Do you divide the fucking equation by two first or you take its square root? Let's clear everyone's head.

>>	Anonymous Mon Jan 24 18:22:38 2011 No.2406420 File: 327 KB, 495x498, 1292736004358.png [View same] [iqdb] [saucenao] [google] >>2406407

>>	Anonymous Mon Jan 24 18:23:38 2011 No.2406426 >>2406407 >Do you divide the fucking equation by two first no >or you take its square root? no

>>	Anonymous Mon Jan 24 18:28:38 2011 No.2406449 File: 10 KB, 800x600, math.png [View same] [iqdb] [saucenao] [google]

>>	Anonymous Mon Jan 24 18:31:38 2011 No.2406477 2x^2+5=41 subtract 5 2x^2 = 36 divide both sides by 2 x^2 = 36/2 simplify x^2 = 18 take the square root x=sqrt(18) x= sqrt(18) and -sqrt(18)

>>	Anonymous Mon Jan 24 19:38:38 2011 No.2406900 >>2406213 Is this one possible or have i just been trolled of 5 minutes of my time here on earth

>>	Anonymous Mon Jan 24 19:48:38 2011 No.2406944 File: 41 KB, 864x609, 1295909129886.jpg [View same] [iqdb] [saucenao] [google] >>2406213 Not sure if possible

>>	Anonymous Mon Jan 24 20:13:38 2011 No.2407090 File: 83 KB, 1134x757, Impossible.jpg [View same] [iqdb] [saucenao] [google] >>2406944 Not possible

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