Many thanks for the reply,

Mark

- Fri Jan 17, 2014 3:46 pm
- Forum: Beginning Algebra
- Topic: Rearranging formula
- Replies:
**2** - Views:
**1865**

Many thanks for the reply,

Mark

Mark

- Thu Jan 16, 2014 7:22 pm
- Forum: Beginning Algebra
- Topic: Rearranging formula
- Replies:
**2** - Views:
**1865**

Me and my daughter are stuck rearranging this formula,her notes from class aren't that clear and it's 35yr since I was at school, please help, X= p-q pq i.e. p-q divded by pq = x where q needs to be the subject We've taken it as far as xpq =p-q but are now struggling. Many thanks Mark

- Mon Oct 21, 2013 3:20 pm
- Forum: Intermediate Algebra
- Topic: Helping with homework!
- Replies:
**6** - Views:
**2060**

Thanks for the help, it finally came to me yesterday evening how the (-) outside the bracket would influence what happens to the numbers inside when the brackets are removed, appreciate the help given,

Mark

Mark

- Sun Oct 20, 2013 5:01 pm
- Forum: Intermediate Algebra
- Topic: Helping with homework!
- Replies:
**6** - Views:
**2060**

Thanks for taking the time to help, think I've nearly got it, is it the effect of removing the bracket on

x^2 -(x^2 +4x -4) =12

that turns +4x into -4x and -4 into +4 then as this is what makes it work out right with x=4 ?

Thanks Mark

x^2 -(x^2 +4x -4) =12

that turns +4x into -4x and -4 into +4 then as this is what makes it work out right with x=4 ?

Thanks Mark

- Sun Oct 20, 2013 1:43 pm
- Forum: Intermediate Algebra
- Topic: Helping with homework!
- Replies:
**6** - Views:
**2060**

Thanks for the reply, the question is to find the value of x and y, this is how it went using factorisation as my daughter has been taught: x^2 - (x-2)^2 = 12 x^2 - (x-2)(x-2) = 12 x^2 -x^2 -4x +4 = 12 x^2 -x^2 -4x = 8 so -4x =8 which gives x= -2 but substituting -2 for x will not give the correct a...

- Sun Oct 20, 2013 10:07 am
- Forum: Intermediate Algebra
- Topic: Helping with homework!
- Replies:
**6** - Views:
**2060**

Please go easy on me as it's 35yrs since I did this at school! I'm helping my daughter and the equation is x^2 - y^2 =12 where y = x-2 . By substitution I've worked the answer out as x=4 but none of the methodology (e.g. factorisation or quadratic formula) in her notes or the text books give me the ...