Jump to content
Home
Forum
Articles
About Us
Tapestry
This is the EYFS Staging Site ×

Maths Help


AnonyMouse_665

Recommended Posts

For me this is definately not a lounge topic but is there anyone who can solve this equation for me. I am in my final part of getting my GCSE maths and really have trouble with algebra.

 

X squared plus 3 x - 5 = 0

 

also 3x +2y=3

 

and 5x-y=-8

 

I really am trying to understand it but could not do it at school and still cant. Why oh why do I need to know this to work with 3-4 year olds.

 

Any help greatly appreciated.

 

Buttercup

Link to comment
Share on other sites

I can not help. but i sympathise exactly, i took me four atempts to finally pass my GCSE maths, and can i remember any of it?, can i heck!. hopefully someone will be along that can help you.

 

Dawn

 

 

For me this is definately not a lounge topic but is there anyone who can solve this equation for me. I am in my final part of getting my GCSE maths and really have trouble with algebra.

 

X squared plus 3 x - 5 = 0

 

also 3x +2y=3

 

and 5x-y=-8

 

I really am trying to understand it but could not do it at school and still cant. Why oh why do I need to know this to work with 3-4 year olds.

 

Any help greatly appreciated.

 

Buttercup

Link to comment
Share on other sites

Are you sure that's not x squared + 4x -5 = 0?

In which case its a quadratic (x+5)(x-1)=0

and you can work out the two possible values of x which give 0

 

 

Then take the second and third equations, you need to multiply one of them by something so that the y term in each is the same. You can then subtract one from the other to get rid of the y's.

In this case multiply the third equation by -2, which gives you

3x+2y=3

-10x+2y=16

Subtract the second equation from the first to get an equation for x

 

Hopefully it will agree with one of the values from the first equation.

 

 

( have to admit all of the above was actually written by Mr Melba, not me.)

Link to comment
Share on other sites

For me this is definately not a lounge topic but is there anyone who can solve this equation for me. I am in my final part of getting my GCSE maths and really have trouble with algebra.

 

X squared plus 3 x - 5 = 0

 

also 3x +2y=3

 

and 5x-y=-8

 

I really am trying to understand it but could not do it at school and still cant. Why oh why do I need to know this to work with 3-4 year olds.

 

Any help greatly appreciated.

 

Buttercup

Link to comment
Share on other sites

3x +2y=3

 

and 5x-y=-8

 

 

3x + 2y = 3

5x - y = -8

 

Multiply second equation by -2 so that both equations have 2y in them...

 

3x + 2y = 3

-10x + 2y = 16

 

Change the equations around so that 2y part is by itself (remember to change signs if you move anything from one side of an equation to the other to keep 'the balance')

 

2y = 3 -3x

2y = 16 + 10x

 

Now the second part of each equation must also be equal to each other (as they are both equal to 2y)...

 

3 - 3x = 16 + 10x

 

Put the xs on one side of the equation and the numbers on the other side (try to keep the xs positive as it makes it easier!!)...

 

3 = 16 + 10x + 3x

3 = 16 +13x

3 - 16 = 13x

-13 = 13x

 

Then divide both sides by 13 to get the value of x...

 

-1 = x

 

Now we know the value of x, substitute this value back into one of the initial equations (the simplest one and I would choose the one that you've already arranged so that the y is by itself!)...

 

2y = 3 - 3x

2y = 3 - 3(-1)

2y = 3 +3

2y = 6

Therefore y = 3

 

Lastly, always put both values back into the initial equations to check your results...

 

3x + 2y = 3

3(-1) + 2(3) = 3

-3 + 6 = 3 (i.e. correct!)

 

5x - y = -8

5(-1) - (3) = -8

-5 -3 = -8 (i.e. correct!)

 

 

Hope that helps

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. (Privacy Policy)