GCSE Maths - Really need help - UK-Muscle Body Building Community

nathanlowe · 18-05-2008, 08:04 PM

Right im trying to master equations and simultaneous equations. I have this question. I have got right near the end but cant finish question off. Please help.

" solve the simultaneous equation "
y = 5x - 1
y = 2x² + 1

So far on it i have done:

5x-1 = 2x² + 1

2x² + 5x + 2 = 0

And from the quadratic equation of ax ²+ bx + c = 0
I have a = 2, b = 5, c = 2

NOW, what do i do ??

Thanks a lot if somebody can help me.

taylzo · 18-05-2008, 08:17 PM

I haven't done this for years so it could be wrong...

5x-1=2x²=1
0=2x²-5x+2
0=x(2x-5)+2
-2=x(2x-5)
-x-2=2x-5
-2=2x-5+x
-2=3x-5
0=3x-5+2
0=3x-3
3x=3
x=1

bb the great · 18-05-2008, 08:19 PM

2x^2 + 5x + 2 = 0

to solve this, you need to get it in the the form

(2x + 1 )(x + 2 )

then either 2x + 1 = 0 or x + 2 = 0

so x = -1/2 or x = -2

do you understand that?

nathanlowe · 18-05-2008, 08:26 PM

Quote:

Originally Posted by bb the great

2x^2 + 5x + 2 = 0

to solve this, you need to get it in the the form

(2x + 1 )(x + 2 )

then either 2x + 1 = 0 or x + 2 = 0

so x = -1/2 or x = -2

do you understand that?

Yes thanks alot. i understand that you factorised to put it in brackets. But i dont understand how - 1/2 can = X ? ?

bb the great · 18-05-2008, 08:30 PM

Quote:

Originally Posted by nathanlowe

Yes thanks alot. i understand that you factorised to put it in brackets. But i dont understand how - 1/2 can = X ? ?

2x + 1 = 0

take the 1 to the other side, equation becomes

2x = -1

then to get rid of the 2 to leave x on its own you need to divide both sides by 2.

2x / 2 = -1 / 2

the 2's on the left cancel. leaving

x = -1 / 2

nathanlowe · 18-05-2008, 08:35 PM

thanks alot pal.
Big help.

Im dreading the non calc paper tomorow. Everything is going out of my head.

In the mocks i got 70 out of 140 which left me with an A overall, good job i did exeptional last year.

Mrdaveyk · 18-05-2008, 08:40 PM

good luck boyo!

Lost Soul · 18-05-2008, 08:40 PM

Quote:

Originally Posted by nathanlowe

In the mocks i got 70 out of 140 which left me with an A overall, good job i did exeptional last year.

Good luck, worst case scenario with most GCSEs, if you get your name right you are awarded at least a B grade

Mrdaveyk · 18-05-2008, 08:45 PM

true! if you got a welsh exam just dont spell cymraeg with a K like my mate did, us welsh are proud?

Jimmy_Cricket · 18-05-2008, 08:47 PM

Fk me, when i worked in the hydro (swalec in your area!!), i used to have a nightmare understanding all those welsh street names, they are absolutely nuts!

nathanlowe · 18-05-2008, 08:50 PM

If you have time bb the great, could you help me with this one ?

zsquared - 8z + 15 = 0
Would i factorise and find two numbers that times to get 8z and add to get 15 ?
( z ) ( z ) = 0
i thought it would be z + 3 and z - 5 but i couldnt get the - 8z from doing FOIL.

Lost Soul · 18-05-2008, 08:51 PM

Quote:

Originally Posted by Mrdaveyk

true! if you got a welsh exam just dont spell cymraeg with a K like my mate did, us welsh are proud?

I dont know one word in the language but believe within a week i could pass a GCSE in it. I shall not go into how and why but lets just say thinks have become a little easier these days

fozyspilgrims · 18-05-2008, 08:53 PM

OMG please tell me that isn't basic GCSE standard!!

bb the great · 18-05-2008, 08:54 PM

Quote:

Originally Posted by nathanlowe

thanks alot pal.
Big help.

Im dreading the non calc paper tomorow. Everything is going out of my head.

In the mocks i got 70 out of 140 which left me with an A overall, good job i did exeptional last year.

wish i was in your shoes, i sat my engineering maths exam last week for my degree, horrible horrible paper.

good luck for tomorrow, i would stop revising about now if i had an exam tomorrow, you wont be able to take much more in. just do something to keep you occupied. brokeback mountain is on in 5 mins

Mrdaveyk · 18-05-2008, 09:00 PM

if he watches broke back mountain i doubt hell get any sleep tonight!

for a welsh exam all you gotta do is spit all over the exam paper and they think you;re fluent!

18-05-2008, 08:04 PM	#1 (permalink)
nathanlowe Getting HUGE! Join Date: Jan 2008 Posts: 1,847	GCSE Maths - Really need help Right im trying to master equations and simultaneous equations. I have this question. I have got right near the end but cant finish question off. Please help. " solve the simultaneous equation " y = 5x - 1 y = 2x² + 1 So far on it i have done: 5x-1 = 2x² + 1 2x² + 5x + 2 = 0 And from the quadratic equation of ax ²+ bx + c = 0 I have a = 2, b = 5, c = 2 NOW, what do i do ?? Thanks a lot if somebody can help me. __________________ "If you hungry its too late" .................................................. ..................... Please take a look at my training journal. It has pictures To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

18-05-2008, 08:17 PM	#2 (permalink)
taylzo Newbie Trainer Join Date: Mar 2008 Location: Northern Ireland Posts: 68	Re: GCSE Maths - Really need help I haven't done this for years so it could be wrong... 5x-1=2x²=1 0=2x²-5x+2 0=x(2x-5)+2 -2=x(2x-5) -x-2=2x-5 -2=2x-5+x -2=3x-5 0=3x-5+2 0=3x-3 3x=3 x=1

18-05-2008, 08:19 PM	#3 (permalink)
bb the great Gym Addict Join Date: Feb 2007 Posts: 280	Re: GCSE Maths - Really need help 2x^2 + 5x + 2 = 0 to solve this, you need to get it in the the form (2x + 1 )(x + 2 ) then either 2x + 1 = 0 or x + 2 = 0 so x = -1/2 or x = -2 do you understand that?

18-05-2008, 08:35 PM	#6 (permalink)
nathanlowe Getting HUGE! Join Date: Jan 2008 Posts: 1,847	Re: GCSE Maths - Really need help thanks alot pal. Big help. Im dreading the non calc paper tomorow. Everything is going out of my head. In the mocks i got 70 out of 140 which left me with an A overall, good job i did exeptional last year. __________________ "If you hungry its too late" .................................................. ..................... Please take a look at my training journal. It has pictures To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

18-05-2008, 08:40 PM	#7 (permalink)
Mrdaveyk It's what you do on the outside that makes you Join Date: Mar 2008 Location: Wales, Pembrokeshire, Pembroke Dock Posts: 1,709 Blog Entries: 1	Re: GCSE Maths - Really need help good luck boyo! __________________ To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. ^^9 stone of bones?! Bulking up?! Take a read^^ To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

18-05-2008, 08:45 PM	#9 (permalink)
Mrdaveyk It's what you do on the outside that makes you Join Date: Mar 2008 Location: Wales, Pembrokeshire, Pembroke Dock Posts: 1,709 Blog Entries: 1	Re: GCSE Maths - Really need help true! if you got a welsh exam just dont spell cymraeg with a K like my mate did, us welsh are proud? __________________ To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. ^^9 stone of bones?! Bulking up?! Take a read^^ To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

18-05-2008, 08:47 PM	#10 (permalink)
Jimmy_Cricket www.file4u.co.uk Join Date: Aug 2006 Location: Scotchland Posts: 1,232	Re: GCSE Maths - Really need help Fk me, when i worked in the hydro (swalec in your area!!), i used to have a nightmare understanding all those welsh street names, they are absolutely nuts!

18-05-2008, 08:50 PM	#11 (permalink)
nathanlowe Getting HUGE! Join Date: Jan 2008 Posts: 1,847	Re: GCSE Maths - Really need help If you have time bb the great, could you help me with this one ? zsquared - 8z + 15 = 0 Would i factorise and find two numbers that times to get 8z and add to get 15 ? ( z ) ( z ) = 0 i thought it would be z + 3 and z - 5 but i couldnt get the - 8z from doing FOIL. __________________ "If you hungry its too late" .................................................. ..................... Please take a look at my training journal. It has pictures To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

18-05-2008, 08:53 PM	#13 (permalink)
fozyspilgrims Getting HUGE! Join Date: Oct 2007 Posts: 1,447	Re: GCSE Maths - Really need help OMG please tell me that isn't basic GCSE standard!! __________________ To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. If you want 5% of your first order use code MP50808 *To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.*

18-05-2008, 09:00 PM	#15 (permalink)
Mrdaveyk It's what you do on the outside that makes you Join Date: Mar 2008 Location: Wales, Pembrokeshire, Pembroke Dock Posts: 1,709 Blog Entries: 1	Re: GCSE Maths - Really need help if he watches broke back mountain i doubt hell get any sleep tonight! for a welsh exam all you gotta do is spit all over the exam paper and they think you;re fluent! __________________ To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. ^^9 stone of bones?! Bulking up?! Take a read^^ To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Thread Tools
Show Printable Version Email this Page
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Brilliant Answers in Maths Exams - Friday Fun	kyrocera	General Conversation	7	04-03-2007 02:35 PM
One for Peg or T of someone good at maths.	Timmy Smooth	Supplementation	6	26-09-2006 07:25 PM
any good with maths?	Nev	General Conversation	11	05-07-2005 09:39 PM