GCSE Maths - Really need help - Page 2 - UK-Muscle Body Building Community

bb the great · 18-05-2008, 09:01 PM

Quote:

Originally Posted by nathanlowe

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.

you have the numbers right but they should both be -

there is a way to set it out and get the - or + but i cant remember, the numbers we have to factorise are like 2.956453823 etc, we just use the quadratic formula.

nathanlowe · 18-05-2008, 09:02 PM

Quote:

Originally Posted by Lost Soul

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

English language is easy, you just need AFOREST techniques n persuasive writing etc.

Lit isnt at all, remembering all the poems and short stories and writing how writers use imagery or personification etc isnt easy at all.

noturbo · 18-05-2008, 09:03 PM

Wow all that maths gave me a headache just looking at it, goodluck with your exam

nathanlowe · 18-05-2008, 09:06 PM

Quote:

Originally Posted by bb the great

you have the numbers right but they should both be -

there is a way to set it out and get the - or + but i cant remember, the numbers we have to factorise are like 2.956453823 etc, we just use the quadratic formula.

Didnt think of trying two -s

So ( z-3)(z-5) = 0

So z - 3 = 0 or z - 5 = 0

z = 3 or z = 5

The quadratic equation is

Is my answer right or should i have been using that method of finding it when theres a + and a - .

It is a non calc paper tho.

nathanlowe · 18-05-2008, 09:19 PM

For gods sake theres loads i cant do.

Make x the subject of y = m + x / x - 2

Prove that x + 2/x - x - 1/x+1 = 2 (2x + 1)/x(x + 1)

bb the great · 18-05-2008, 09:38 PM

you wont have to use the quadratic equation on a non calc paper, you just need to remember to try all different possibilities.

Captain Hero · 18-05-2008, 09:41 PM

all of that looks like gibberish to me!! I got a D in my maths GCSE, found it quite difficult to get my head around things like that.

Good luck to you nathan!

bb the great · 18-05-2008, 09:47 PM

Quote:

Originally Posted by nathanlowe

For gods sake theres loads i cant do.

Make x the subject of y = m + x / x - 2

Prove that x + 2/x - x - 1/x+1 = 2 (2x + 1)/x(x + 1)

mate, im not doing all of them for you,ive got a thermodynamics exam to revise for,

check out http://www.ebst.co.uk/algebra/container.html

this is the basic algebra one, some stuff on there is a bit advanced for gcse, but you can make use of the video tutorials (all except logs, binomial theorem and cubics) i think

nathanlowe · 18-05-2008, 09:49 PM

Thanks alot. But, youno on that question you did earlier
zsquared - 8z + 15 = 0 and you got z = 3 and z = 5

when i used the quadratic formula on my calc i got z = 6.8 and 3.1

Which is right ?

thanks for the link.

taylzo · 18-05-2008, 09:51 PM

surely if you're doing a non calc paper you shouldn't worry about that atm?!

bb the great · 18-05-2008, 09:56 PM

Quote:

Originally Posted by nathanlowe

Thanks alot. But, youno on that question you did earlier
zsquared - 8z + 15 = 0 and you got z = 3 and z = 5

when i used the quadratic formula on my calc i got z = 6.8 and 3.1

Which is right ?

thanks for the link.

you dont need to use the quadratic formula, so dont use it!

z = 3 and z = 5 is correct

nathanlowe · 18-05-2008, 10:05 PM

Thanks alot.

BSF James · 19-05-2008, 08:16 PM

I got (for the original equation):

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

if 2x-1 = 0
then
2x =1
x = 0.5

if x-2 = 0
then
x=2

so x = 2 or 0.5

I think thats right. I'm ashamed how rusty I am though. I aced GCSE and A level maths, then did very advanced maths in my engineering degree but I really dont remember any of it. I must have killed too many brain cells with guinness back then...

BSF James · 19-05-2008, 08:20 PM

Quote:

Originally Posted by nathanlowe

Didnt think of trying two -s

So ( z-3)(z-5) = 0

So z - 3 = 0 or z - 5 = 0

z = 3 or z = 5

The quadratic equation is

Is my answer right or should i have been using that method of finding it when theres a + and a - .

It is a non calc paper tho.

This is correct - z = 3 or 5

18-05-2008, 09:03 PM	#18 (permalink)
noturbo Looking Freaky Join Date: Oct 2006 Location: Cumbria Posts: 663	Re: GCSE Maths - Really need help Wow all that maths gave me a headache just looking at it, goodluck with your exam

18-05-2008, 09:19 PM	#20 (permalink)
nathanlowe Getting HUGE! Join Date: Jan 2008 Posts: 1,848	Re: GCSE Maths - Really need help For gods sake theres loads i cant do. Make x the subject of y = m + x / x - 2 Prove that x + 2/x - x - 1/x+1 = 2 (2x + 1)/x(x + 1) __________________ "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, 09:38 PM	#21 (permalink)
bb the great Gym Addict Join Date: Feb 2007 Posts: 280	Re: GCSE Maths - Really need help you wont have to use the quadratic equation on a non calc paper, you just need to remember to try all different possibilities.

18-05-2008, 09:41 PM	#22 (permalink)
Captain Hero is really, really, ridiculously good looking. Join Date: Jun 2004 Location: United Kingdom Posts: 6,442	Re: GCSE Maths - Really need help all of that looks like gibberish to me!! I got a D in my maths GCSE, found it quite difficult to get my head around things like that. Good luck to you nathan! __________________ Captain Hero " Nothing great was ever achieved by being realistic!" 1. Captain Hero To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. 25 up, 3 down To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. One of the most messed up characters in To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. , Captain Hero is a parody on Superman. He is also a To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. , enjoys To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. , is a bisexual, has a childish personality and possibly a mental disorder, is at times a To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. , practices To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. , had a romance with 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. , Bleh, and Unusually-Flexible-Girl. "By the time I get there, the girl is either already safe, or dead. Either way, there's going to be some serious fondling." ~Captain Hero.

18-05-2008, 09:49 PM	#24 (permalink)
nathanlowe Getting HUGE! Join Date: Jan 2008 Posts: 1,848	Re: GCSE Maths - Really need help Thanks alot. But, youno on that question you did earlier zsquared - 8z + 15 = 0 and you got z = 3 and z = 5 when i used the quadratic formula on my calc i got z = 6.8 and 3.1 Which is right ? thanks for the link. __________________ "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, 09:51 PM	#25 (permalink)
taylzo Newbie Trainer Join Date: Mar 2008 Location: Northern Ireland Posts: 68	Re: GCSE Maths - Really need help surely if you're doing a non calc paper you shouldn't worry about that atm?!

18-05-2008, 10:05 PM	#27 (permalink)
nathanlowe Getting HUGE! Join Date: Jan 2008 Posts: 1,848	Re: GCSE Maths - Really need help Thanks alot. __________________ "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.

19-05-2008, 08:16 PM	#28 (permalink)
BSF James BodyShapers Fitness MD Join Date: Sep 2003 Location: Telford Posts: 1,258	Re: GCSE Maths - Really need help I got (for the original equation): 5x-1=2x² +1 -2 = 2x² -5x 2x² -5x = -2 (2x -1)(x-2) = 0 if 2x-1 = 0 then 2x =1 x = 0.5 if x-2 = 0 then x=2 so x = 2 or 0.5 I think thats right. I'm ashamed how rusty I am though. I aced GCSE and A level maths, then did very advanced maths in my engineering degree but I really dont remember any of it. I must have killed too many brain cells with guinness back then... __________________ To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. -Now with FREE shipping available on all UK mainland orders! 5% off your first order - use discount code ukm6. The #1 choice for To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. with rapid, reliable service. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. - research backed sports nutrition.

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