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#26 2018-01-13 19:00:26

Anatoly
Guest

Re: pls HELp with maths

kreacher wrote:
Firecrackericebreak wrote:

y = x * 25 + (x * 25) ^ 2
y = x * 25 + x^2 + 50x + 625

um (x*25)(x*25)=x^2+625 its not (x+25)(x+25) so u dont times them all by each other

You're right

y = 25x + (25x)²

625x² + 25x - y = 0

Discriminant = b² - 4ac = 625-4*625*y = 3*625*y = 1875y

( -b +- D's Root ) : 2a = ( -25 +- √1875y) : 1250

x1 = (-25 + 25*√(3y)) : 1250 = 25(√(3y) - 1) : 1250 = 50(√(3y) - 1)
x2 = (-25 - 25*√(3y)) : 1250 = -25(√(3y) + 1) : 1250 = -50((√3y) + 1)

kreacher wrote:
Firecrackericebreak wrote:

y = x * 25 + (x * 25) ^ 2
y = x * 25 + x^2 + 50x + 625

um (x*25)(x*25)=x^2+625 its not (x+25)(x+25) so u dont times them all by each other


is this right? y=25x+625x^2
625x^2+25x=0
(-25+(625-2500))/1250=-1.52
(-25-(625-2500))/1250=0.74

Where's y?

#27 2018-01-13 19:11:49

TaskManager
Formerly maxi123
From: i really should update this
Joined: 2015-03-01
Posts: 9,457

Re: pls HELp with maths

AnatolyEE wrote:

x1 = (-25 + 25*√(3y)) : 1250 = 25(√(3y) - 1) : 1250 = 50(√(3y) - 1)
x2 = (-25 - 25*√(3y)) : 1250 = -25(√(3y) + 1) : 1250 = -50((√3y) + 1)

umm that doesnt apparently work
use a functions grapher like this one to check your result
enter all of the three functions, if it's correct then you will see that the X1= and X2= functions will overlap with Y= function.
6a22LUuySg22ZimuWWohJA.png

heres my result, i did it the same way as you (through discriminant)

maxi123 wrote:

X1 = (-1 - sqrt(1+4y))/50
X2 = (-1 + sqrt(1+4y))/50

_0Gam52pTb6s2APgr6sYwg.png

you seemingly made a mistake somewhere and this line is where most likely it is:

AnatolyEE wrote:

Discriminant = b² - 4ac = 625-4*625*y = 3*625*y = 1875y


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#28 2018-01-13 21:25:24, last edited by kreacher (2018-01-13 21:51:56)

kreacher
Member
From: Wakanda
Joined: 2015-03-31
Posts: 409

Re: pls HELp with maths

omg im so stupid i forgot about the y. would the y count as the c in the -4ac? in the end i got              -1+-sqrt(1-4y)
                                                                                                                                               ----------------------
                                                                                                                                                           50


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#29 2018-01-13 22:21:20

TaskManager
Formerly maxi123
From: i really should update this
Joined: 2015-03-01
Posts: 9,457

Re: pls HELp with maths

kreacher wrote:

would the y count as the c in the -4ac?

in a quadratic equation, everything that isnt multiplied by x is part of c. so yes


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#30 2018-01-18 13:13:09

Latif
Member
From: The Netherlands
Joined: 2015-03-13
Posts: 1,206

Re: pls HELp with maths

Oh wow I found a very useful tool to solve equations. I don't need you anymore guys //forums.everybodyedits.com/img/smilies/wink

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#31 2018-01-18 14:12:20

Gosha
Member
From: Russia
Joined: 2015-03-15
Posts: 6,202

Re: pls HELp with maths

Latif wrote:

I don't need you anymore guys

you used me as a tool //forums.everybodyedits.com/img/smilies/sad

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#32 2018-01-18 15:33:39

TaskManager
Formerly maxi123
From: i really should update this
Joined: 2015-03-01
Posts: 9,457

Re: pls HELp with maths

Latif wrote:

Oh wow I found a very useful tool to solve equations. I don't need you anymore guys //forums.everybodyedits.com/img/smilies/wink

might as well find a very useful tool not to come back to these forums anymore, would you


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#33 2018-01-18 16:11:53

Latif
Member
From: The Netherlands
Joined: 2015-03-13
Posts: 1,206

Re: pls HELp with maths

Gosha wrote:
Latif wrote:

I don't need you anymore guys

you used me as a tool //forums.everybodyedits.com/img/smilies/sad

Don't be sad I appreciated your help //forums.everybodyedits.com/img/smilies/big_smile

maxi123 wrote:

might as well find a very useful tool not to come back to these forums anymore, would you

Instant hate //forums.everybodyedits.com/img/smilies/sad

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#34 2018-01-18 19:48:28

kreacher
Member
From: Wakanda
Joined: 2015-03-31
Posts: 409

Re: pls HELp with maths

lol its not hard latif just substitute stuff in for -b+-sqrt(b^2-4ac) with y=ax^2+bx+c
                                                                ----------------------
                                                                           2a


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#35 2018-01-18 20:10:11

TaskManager
Formerly maxi123
From: i really should update this
Joined: 2015-03-01
Posts: 9,457

Re: pls HELp with maths

legends are saying that in 3018 people still will be posting solutions to latif's problem in this topic..


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#36 2018-01-19 09:43:35

soniiiety
Member
From: peaceful dojo
Joined: 2016-02-10
Posts: 1,747

Re: pls HELp with maths

i suck at maths i only know 1x and 10&11 X

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#37 2018-01-19 11:48:00

TaskManager
Formerly maxi123
From: i really should update this
Joined: 2015-03-01
Posts: 9,457

Re: pls HELp with maths

soniiiety wrote:

i suck at maths i only know 1x and 10&11 X

that's binary though?


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