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/sci/ - Science & Math

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4161563 No.4161563 [Reply] [Original]

And neither can /sci/.

>> No.4161566

http://www.wolframalpha.com/input/?i=OP+is+a+faggot

>> No.4161572

>>4161566
I lolled.

>> No.4161575

x1,x2= (20 +/- sqrt(28))8

>> No.4161576

l2complete the square.

>> No.4161577

>>4161575
that should have been not *8 but divided by 8

>> No.4161578

5/2 +/- sqrt(7)/2

can you delete this thread then go back to /b/?

>> No.4161586

>>4161572
what you didn't see is this:
http://www.wolframalpha.com/input/?i=faggot

>> No.4161587

4x^2 -14x -6x + 18
4x^2 -14x -6x = 0 - 18
2x -14x -6x = -18
2x -20x = -18
-18x = -18
-18x / -18 = -18 / -18
x = 1

>> No.4161595

link to the /b/ thread i want to read the tard replies

>> No.4161597

>>4161595
>implying OP wasn't just using that as an excuse for him to get his homework done

>> No.4161598
File: 637 B, 145x22, 1c110885bd9155bea6b6630e7d24d6c4.png [View same] [iqdb] [saucenao] [google]
4161598

>> No.4161599

>>4161595
>implying the tard replies of /b/ are more interesting than the tard replies of /sci/

>> No.4161600
File: 892 B, 192x44, 5b2af7493f57bb0ff40d0113763aa427.png [View same] [iqdb] [saucenao] [google]
4161600

>> No.4161601

>>4161598

>implying there aren't 4 terms in ops picture

WHERE IS THE "D" IN YOU'RE FORUMLA YOU FUCKING RETARD

>> No.4161603
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4161603

>>4161587

>> No.4161604

>>4161587
somehow you fail...

>> No.4161605

the question is ambiguous

you can see it as

4x^2 - (14x - 6x + 18)

or

4x^2 - 14x - (6x + 18)

>> No.4161606

>>4161600
>>4161598
>4x^2-14-6x+18=0
>quadratic
No.

>> No.4161607

>>4161587

>4x^2 -14x -6x = 0 - 18
>2x -14x -6x = -18

What? 4x^2 is evolving!
Congratulations! Your 4x^2 evolved into 2x!

>> No.4161608

>>4161601
>cannot add -14 and -6
>mad as fuck

>> No.4161610

4x^2-14x-6x+18=0
4x^2-20x+18=0
2(2x^2-10x+9)=0
a*c=2*9=18 18 1,18 2,9 3,6
none of those
put together
equal b(10)

>> No.4161611

>>4161608
implying you can add terms that aren't alike

fucking retards on /sci/ today

>> No.4161612

well hint hint... think of it as
4x^2 - 14x -6x +18 = 0
<=> 4x^2 - 20x + 18 = 0
see 3 terms... simple matter of a subtraction now use formulas an stop this nonesense

>> No.4161615

>>4161606
>4x^2-20x-18
>4x^2
>^2
>not quadratic

>> No.4161620

4x^2 -14x - 6x + 18 = 0

4x^2 -x(-14+6) = -18

4x^2 = -18 + x(-14+6)
ln(4x^2) = ln(-18+x(-8))
2(ln4)+2ln(x) = ln(-8x-18)
e^(2ln4+2lnx) = -8x + 18
8 + 2x = -8x + 18
10x = 10

x = 1

>>4161587
confirmed for correct, every other answer is a tard.

>> No.4161623

well anyhow this is starting to be booring...

x1=31/8=3.875
x2=9/8=1.125

there /b/ can! simple mathematics

>> No.4161625

>>4161615

solve for x

2^2 = x

>^2
>not quadratic

your logic doesn't follow

>> No.4161626

and here we have another proof that /sci/ is full of biologists

>> No.4161627

>>4161620
>x=1
Put 1 in the original formula, it won't equal 0.

>> No.4161630

>>4161620

Say what?
x=1???

4*1^2-14*1-6*1+18=0

<=>4-14-6+18=0 ???

nice one

>> No.4161636

>>4161627

what???

4 - 14 - 6 -18 = 0

lrn to fucking add i thought this was /sci/

>> No.4161649
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4161649

>>4161636
>4 - 14 - 6 -18 = 0

>> No.4161653

>>4161563
/b/ would figure out calculus before it even understood order of operations

>> No.4161663

<span class="math"> x = \frac{5\pm\sqrt{112}}{2}[/spoiler]

>> No.4161667

>mfw so many people in this thread have no idea how to combine like terms.

>> No.4161672

4x² -14x -6x +18 = 0
2x² -10x +9 = 0
(sqrt(2)x -3)² = 0
x' = 3sqrt(2)/2
x" = 0

>> No.4161673

>>4161667

>mfw you don't have a face
>mfw you can't spot a troll

>mfw i don't have a face

>> No.4161677

>>4161663
I'm sorry for being retarded. I forgot to do an extra step.

It should be <span class="math">\sqrt{7}[/spoiler]
not 112

>> No.4161679

>>4161672
>(sqrt(2)x -3)² = 0
what the fuck

>> No.4161683

4x^2 - 14x -6x +18 = 0
4x^2 -20x +18 = 0
2x -20x +18 = 0
2x -20x = -18
18x = -18
so
x = ±1
I think...

>> No.4161687

>>4161683
You went from <span class="math">4x^2[/spoiler] to 2x.

How did you lose an x

>> No.4161692

4x^2 - 14x - 6x + 18 = 0
4x^2 - 20x + 18 = 0
x(4x - 20) + 18 = 0
(4x - 20) + 18/x = 0
4x - 20 + 18/x = 0
x(4 + 18) - 20 = 0
22x - 20 = 0
22x = 20
x = 20/22
x = 10/11

>> No.4161700

>>4161692
>4x - 20 + 18/x = 0
>x(4 + 18) - 20 = 0

But thats wrong.

It would have gone from
4x-20+18/x
to
x(4+18/x^2) - 20

>> No.4161705 [DELETED] 

<span class="math">4x^2 - 14x - 6x + 18 = 0[/spoiler]
<span class="math">4x^2 - 20x + 18 = 0[/spoiler]
<span class="math">x^2 - 5x + \frac{9}{2} = 0[/spoiler]
<span class="math">(x - \frac{5}{2})^2 - \frac{25}{4} + \frac{9}{2} = 0[/spoiler]
<span class="math">(x - \frac{5}{2})^2 - \frac{7}{4} = 0[/spoiler]
<span class="math">x - \frac{5}{2} = \pm,\sqrt{\frac{7}{4}}[/spoiler]
<span class="math">x = \frac{5}{2} \pm,\pm,\sqrt{\frac{7}{4}}[/spoiler]
<span class="math">x \approx 3.823[/spoiler] or <span class="math">1.177[/spoiler]

>> No.4161709

<span class="math">4x^2 - 14x - 6x + 18 = 0[/spoiler]
<span class="math">4x^2 - 20x + 18 = 0[/spoiler]
<span class="math">x^2 - 5x + \frac{9}{2} = 0[/spoiler]
<span class="math">(x - \frac{5}{2})^2 - \frac{25}{4} + \frac{9}{2} = 0[/spoiler]
<span class="math">(x - \frac{5}{2})^2 - \frac{7}{4} = 0[/spoiler]
<span class="math">x - \frac{5}{2} = \pm\sqrt{\frac{7}{4}}[/spoiler]
<span class="math">x = \frac{5}{2} \pm\sqrt{\frac{7}{4}}[/spoiler]
<span class="math">x \approx 3.823[/spoiler] or <span class="math">1.177[/spoiler]

>> No.4161714
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4161714

>40 posts later

>> No.4161716

x1 ≈ 1.2; x2 ≈ 3.8

>> No.4161717

THIS IS MADNESS STOP IT
>>4161623 already solved it!!!!!!

>> No.4161719

>>4161687
4x^2
2*2 = 4
x*x = x^2
sort like that

>> No.4161721

>>4161719
but you didn't divide by X, you only divided by 2.

>> No.4161728

<div class="math"> x = \frac{-b\pm\sqrt{b^2-4ac}}{2a}</div>

>> No.4161727

what the shit is going on up in here? this is /sci/...

>> No.4161726

what the FUCK are you guys doing?
'herpderp it's 1'
Try filling in 1, idiots. It won't equal 0.

4x²-20x+18.
Use quadratic formula with a=1, b=-5, c=4.5.

Answer: x1,2= 0.5*(5+-sqrt(7)).

>> No.4161731

>>4161721
good point

>> No.4161733

>>4161709
>>4161709
>>4161709
>>4161709
>>4161709
>>4161709
>>4161709
>>4161709
>>4161709
>>4161709

>> No.4161737

>>4161709
>>4161726

These guys are right. Everybody else fuck off.

>> No.4161743
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4161743

4x^2 - 14x - 6x + 18 = 0

4x^2 - 20x + 18 = 0

2x^2 + 2x^2 - 10x - 10x + 9 + 9 = 0

2x^2 - 10x + 9 = -2x^2 + 10x - 9

2x^2 - 10x + 9 = -1 * (2x^2 + 10x - 9)

1 = -1

therefore x = -x
/thread

>> No.4161745

i solved it

/b/ = /sci/

>> No.4161748

>>4161743
it too me way to long to realize you divided by 0

>> No.4161758

>>4161743
>mfw you fucked it up

<span class="math">-2x^2 + 10x - 9 = -1(2x^2 + 10x - 9)[/spoiler]? Right.

>> No.4161767

>>4161758
ya I know, I facepalmed when I realized I messed that up, I just didn't feel like correcting it

>> No.4161768

>>4161743
lol, can anyone explain what he did wrong? i dont get it

>> No.4161772

>>4161768
He divided by zero

>> No.4161774

>>4161768
divide by 0

>> No.4161775

>>4161768
(2x^2 + 10x - 9) = 0

He divided by (2x^2 + 10x - 9)

>> No.4161776

>>4161758
lol you messed it up too! extra negative on the first term

>>4161768
division by zero, the terms being divided are half of the original equation, which the original equation tells you is zero.

>> No.4161781

>>4161776
What? There is supposed to be a negative sign there... try re-reading the last two RHSs of >>4161743

>2x^2 - 10x + 9 = -2x^2 + 10x - 9
>2x^2 - 10x + 9 = -1 * (2x^2 + 10x - 9)

>> No.4161790
File: 36 KB, 816x612, 2011-12-19_10.34.06.jpg [View same] [iqdb] [saucenao] [google]
4161790

amidonitrite?

>> No.4161794

>>4161790
Simplify but yes, thats right

>> No.4161796

this entire thread is shameful

if you can't do the QF in your head then gtfo

>> No.4161804

>>4161794

i forgot how to simplify. *shame shame shame*

>> No.4161812

>>4161781
yes but you had

-2x^2 - 10x + 9 = -1 * (2x^2 + 10x - 9)
^

>> No.4161817

Why are people still posting in this?

>> No.4161822

>>4161817
To prove that we are smarter than /b/!
I think we've almost got a solution too, keep trying guys we got this

>> No.4161830

Please, for fuck sake, let there be a lot of trolls here. So many people don't know how to simplify 'like' terms.

>4x^2-14x-6x+18=0?
>4x^2-20x+18=0
>2x^2-10x+9

a=2
b=-10
c=9

QF.

>> No.4161832

>>4161830
We all get how to do it, there are just a lot of trolls in here.

>> No.4161854
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4161854

>>4161830
>2011
>getting trolled

>> No.4161937

>>4161804
the answer is

((5/2)+sqrt(7)/2)) or ((5/2)-sqrt(7)/2))

>> No.4161947
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4161947

>mfw this is still here

>> No.4161975

>>4161947
>yfw this is just the beginning
>yfw it's still gonna be here tomorrow