how?

x = OP's brain capacity.

>>684964480

x = -3

x = 0

2x^2 + 6x = 0
6x = 2x^2
x = you need to count alone. Its not my homework faggot

x=-3 ,fagot

>>684964663
6x=-2x^2

>>684964617
x is diferent of 0 faggot

>>684964480
zero is definitely a solution

>>684964480
It is not hard.
https://en.wikipedia.org/wiki/Quadratic_equation

Easy way to solve this one (only applies to Equations of the form x^2 + p*x + q = 0)
-(p/2) +- sqrt((p/2)^2 -q)

>>684964480
You're either <14 or retarded

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>>684965126
and thank me later

pq-formula

x^2 + (6x)/2 = 0

-3/2 +- sqrt( (3/2)^2 )

x1 = -3/2 + 3/2 = 0
x2 = -3/2 - 3/2 = -3

>>684964480
just brute force it
what happens if you set x=1
then 2, 3... if it doesnt go anywhere, go backwards

>>684965330
It has to be +- to get multiple solutions

>>684965421
idiot nigger

2x^2 + 6x = 0
2x(x+3) = 0
x=0 v 2x+3=0
x=0 v x=-3

>>684965378
This.
And btw OP i would not ask this on /b/ but whatever
>>>/sci/

>>684964988
>>684964988
faggot your mother

>>684965463
tends to work with highschool tier equations though
trust me
I teach maths grades 5-12

>>684965463
whats the problem? dont need no fancy formula if a simple heutistic gets you to the solution

>>684965560
How do you get 2 x's ?

>>684964480
factorize nigga
2x(x+3)=0

>>684965126
You don't need the quadratic equation to solve this.

x=0 or x=3
because:
x(2x+6)
the factors have to be 0

>>684965901
x² means x times x
therefore 2x² means 2 times x times x
separate as necessary

>>684965673
>>684965793
Look at this dumb nigger

Do you teach your kids your nigger math?

>>684965793
*heuristic
sry, missed my r button, stupid mobile phones

It's got 2 fucking solutions : x1 and x2..
/_\ = b^2 - 4*a*c = 6^2 - 4*2*0 = 36
x1 = (-b + sqrt(36) ) / 2a = (-6 + 6) /2 = 0
x2 = (-6 - 6 ) /2 = -6
You guys are retarded

>>684965560
This.

2x^2 + 6x = 0
2x(x+3) = 0
2x = 0 or x+3 = 0
x = 0 or x = -3
x = 0 or -3

>>684966162
no
each of my kids are smarter than most of you dipshits combined so they figure this shit out for themselves

>>684966220

https://www.mathsisfun.com/algebra/quadratic-equation.html

>>684966162
fuck you, this is simple integer math, just plot the function and search the graph, i can do this in my head. why waste time?

>>684966346
I'm a biomedical engineer going after my PhD so yes please tell me how much smarter your kids are.
Dumbass
Protip that shit doesn't work for real math

>>684965673
tends to not work if a fraction is one of the solutions
trust me
I teach your mom how to sex properly

>2x^2 + 6x = 0
>2x(x + 3) = 0
>x = 0
>x + 3 = 0 ; x = -3
eZ

>>684966453
Because you can also factor things in your head retard

>>684966492
instead of yanking it with one hand, and patting yourself on the back with the other, show us your solution.

>>684966220
Oops
x2 = (-6 -6) / 2*2 = -12 / 4 = -3
My bad

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just use the quadratic equation whenever you see a quadratic. In your case a=2, b=6 c=0>>684964480

When entering into your calculator do it twice. once with the += being a + and the other a minus for multiple solutions.

>>684965038
Divide all terms by X and you see it'sactually a linear equation with one solution.

2x + 6 = 0

Tell me how zero is a solution again?

>>684966705
Sorry += should be +-

>>684966632
2x(x+3)=0
X=0,-3
Super hard nigger

>>684964480
>2x^2 + 6x = 0
wolframalphadotcom

>>684966760
its a quadratic. basic year 10 maths. maybe even year 9

>>684966760
Because you can't just drop variables

>>684966864
In Romania you do this in the 8th grade.

Should we /thread this shit? I think all of us know that the solution is x= -3 x= 0

>>684966760
You can't divide by zero you fucking cuck

>>684967000
How are you still a shithole then?

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Here you go op, good thing for you I'm a math major. Also work as a math tutor.

>>684967000
year levels and grade a probably different. is aus it goes R, 1-12

>>684964480
quit school

>>684966760
the f...? what? you insert 0 as x into the original function and get a correct solution

>>684966492
>Protip that shit doesn't work for real math

protip
I have an m.sc. in maths and cs
"""real""" maths is not what you do in biomed. eng., its just crunching numbers
"""real""" maths is not what this thread is about
"""real""" maths has nothing to do with highschool maths, such as solving quadratic equations
if you have problems with THIS, best give up on that phd.

>>684966568
>trying integers tends not to work if the solution is not an integer
thanks captn obvious.
if you could into reading comprehension, you'd understand that what I said is:
your typical highschool homework quadratic equation is likely to have at least one integer zero
because fuck correcting anything else, thats too much work x30 kids

>>684967081
tf are you even doing. wrong unit

>>684966828
>clearly a school problem
>shows no working

Stop trying to be a smart arse all the fucking time.

>>684967108
>implying your college degree means something if you don't actually have it

report for underage b8

>>684966760
this is how NOT to solve a quadratic equation, children.

>>684965673
I feel sorry for the kids you teach.

How hard is it to teach them to factorise out the x. Don't even need to teach the quadratic equation.

>>684967220
>Implying in general you faggot

>>684966760
by doing this you must assume that x is not equal to zero.

>>684964480
2x^2 + 6x = 0
2x^2 = -6x
x^2 = -3x
x = -3

2 (-3)^2 + 6(-3) = -

2 (9) + (-18) = 0

18 - 18 = 0

check

>>684966022
How is this so far down. We've had people suggesting trial and error, quadratic formula...

But it's done in like a second if you do this, and it's easy.

>>684967049
It's not dividing by zero, it's dividing zero by a variable

>>684966864
>>684966938
But if you divide the whole equation by X (both sides), it doesn't change the value of the equation, just rearranges it.

>>684967182
What the fuck does that even mean?

>>684967242
read the thread again. you will notice that that is literally what I advocate

>>684965673

You have got to be a kid in a remedial math class who never had to deal with x being anything other than an integer. Have fun with low math scores on your ACT and SAT. I had horrible math teachers in high school and none of them were so bad as to recommend brute force for algebra.

no one uses this simple shit tho?
2x^2 = -6x
2x = -6
x = -3
x = 0, known from the start

>>684964988
retard, for this to be valid, you have to transform this expression into its canonic (idk how to say it in english) form and then you get to find the solutions. and 0 is one of them

>>684967193
No working? He's done the one single step needed to solve this problem. Once you get to the first bit, it's clear either one of the 2 sections is 0.

>>684965901
your parents must be very proud of you

>>684967178
>implying calculus/def eq isn't real math

Just keep telling me that I don't know how to math as I use math to program mathematically based biological systems in MATLAB
Pleb math majors thinking only math majors use math

2x^2 + 6x = 0
x(2x +6) = 0

2x +6 = 0
2x = 6
x = 3

Answer is x = 0, x = 3

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>>684967193
here is working out.

>>684966760
>>684967346
>guaranteed replies

I never thought I'd see even an algebra thread trolled this hard.

>>684967401
>projecting this hard
lol k

>>684966022
the proper way to do it finally

>>684965424
don't feed the summer

>>684967599
Pardon me, its x = -3

2x +6 = 0
2x = -6
x = -3

>>684967193
That's all the work it requires
If you can't figure out the gap steps you're retarded

>>684967599
2x = -6*
cant move it to the other side without giving in a minus

>>684967612
This is how its done idiots. disregard everything else.

>>684967629
/b/ will argue about anything.

Also: fuck you, you're wrong.

>>684967308
>being this mad

>>684965560
Good one.

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It's simple

>>684967178
>anything else, thats too much work x30 kids
too much for them, or too much for you?
because if you mean too much for you, i can understand, it's very difficult to check homework, so much more time spent reading "x = -3/8" versus reading "x = 2"

>>684964480
x = 0
or
x = -3

both work.

>>684964988
Square functions have two solutions, one is obvious from the start (2*0²+6*0 = 0) and the other is easily derived by solving for x like with a linear function:
2x²+6x = 0 | -6x
2x² = -6x | /x
2x = -6 | /2
x = -6

>>684968015
This
He's just a lazy cunt

>>684966705
quadratic formula doesn't work for this instead you need to factorise the equation instead

>>684966760
you nigger of course 0 isnt a solution after dividing by x, if it would you would divide by 0. doesnt mean its not a solution to the original problem.

>>684966760
shithead idiot

>>684967807
>starting Internet fights. Fucking keyboard warriors. Did your mommy not give you your doritos and mt. Dew this morning?

>>684964480
6x^2+2x=0
6x^2=2x /:x
6x=2 /:2
3x=1

Im not sure about it(becaus 0 means that it is imposible and it has no answer) but this was in first year of higschool. Op is 15

>>684967612
>>684968007
Finally some people with brains. DO this if you havent already lost all your bran cells for even having this thread open.

>>684967561
>matlab
Like I said, crunching numbers.

Do you prove anything in matlab? No you don't.

>A compact Hausdorff-Space is normal, and thus regular.

^maths

>>684967108
YOU DON'T PUT THE TIMES SIGN IN FRONT OF THE BRACKETS

WHAT ARE YOU PLAYING AT OP?!?

>>684968169
>triggered
Go eat your chicken tendies

>>684966760
>Tell me how zero is a solution again
Okay.
2*0²+6*0 = 0
That was beyond easy.

>>684968178
You dumb asshole, you complete the square then factor.

>>684967700
This

>>684968178
Typo?
It's 2x²+6x, not 6x²+2x.

>>684968286
Top fucking kek

How much do you actually use math in your job
>protip less than me because you're teaching children
If you had a respectable career you could possibly make some points but you don't.
On top of that you're a shitty one who wants to use brute force

>>684968116
TIL: -6/2 == -6

>>684968129
Just tested on graphics calculator,. works perfectly. its a quadratic, it can be factorised also. both viable options.

>>684968559
Fuck. -3, of course.

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>>684964480
2x^2+6x=0
2x(x+3)=0
x=0, -3

>>684968620
yeah I just noticed my mistake I accidently swapped a with c

sorry anon

>>684968286
The reason we use matlab is to create visual models of biological systems
>make a real time temperature gradient cross section of a warming soda can with ambient temperature with t-step .01
Oh yeah you have to do it by hand or you're also crunching numbers

>>684968511
>How much do you actually use math in your job
>protip less than me because you're teaching children
touché
>If you had a respectable career you could possibly make some points but you don't.
teaching is not a respectable career. ok. and yet they wonder why "kids these days" are spoiled brats. yeah. you're part of the problem m9

>On top of that you're a shitty one who wants to use brute force
>intentionally misreading me, AGAIN
if you could actually read, you could possibly make some points, but you don't.

>>684968787
no problem.Atleast you know what your doing unlike 99% of this thread

This one is easy, just factor out 2.

I remember when this shit was difficult. I just finished calculus 3 this semester

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These are the 2 answers. 0 and -3 dont listen to the bait

>>684969047
factor out 2x. 2x * x is 2x^2. 2x * 3 is 6x

>>684968790
> >make a real time temperature gradient cross section of a warming soda can with ambient temperature with t-step .01
>maths
also
>you have to do it by hand or you're also crunching numbers
thats not what I said dummie. what I said (and say) is that either doing it by hand or with some fancy program, it's not maths. its visualizing your model (or whatever you were trying to do there)

>>684969142
>>684968007
>>684967612
>>684966705
Use these op and any other people who want to understand basic maths

>>684968129
Quadratic formula works. C is 0.

>>684969150
Yes. Please excuse my mistake.

Fuckin idiots

2x^2 +6x = 0
2x^2 = -6x

Devide by x

2x = -6

Devide by 2

x= -3 or x= 3

Fuckin morons

>>684969396
np

>>684964480
2x(x + 3)
X=0
X=-3

>>684969432
bait/idiot

>>684969299
Yeah but the quadratic formula is unnecessary as it takes up too much time when there is a far more easy method. Recognizing the simple factoring speeds the process to 2 steps.

>>684969481
thx finally some1 whos not retarded

>>684969432
Do not listen to this faggot. Square Root provides the +/- quality he's claiming, and he hasn't rooted the problem. This is bait.

>>684969636
Shame I completely failed my c1 exam today

Can someone explain how this works

>>684969432
1- it would be written as x=+-3

2- x does not equal 3 and the only time it would be both the equal or the plus sign is if you square rout it

3- x equals 0 and -3

>>684964617
>Thread
>>684964480
The expression OP is using is ax^2+bx+c=0, so we can conclude, that a=2, b=6 and c=0
We find d=b^2-4*a*c=6^2-4*2*0=36
>2 solutions
>x=(-6+sqrt(36))/(2*2)=0
>x=(-6-sqrt(36))/(2*2)=-3

>>684969904
here>>684969142
>>684968007
>>684967612
>>684966705

>dividing by X dora not change the result
2x=0
divide
2=0
Congrats, you broke it.