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Helping with homework!  TOPIC_SOLVED

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 ...
by R515
on Sun Oct 20, 2013 10:07 am
 
Forum: Intermediate Algebra
Topic: Helping with homework!
Replies: 6
Views: 1024

Re: Helping with homework!  TOPIC_SOLVED

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...
by R515
on Sun Oct 20, 2013 1:43 pm
 
Forum: Intermediate Algebra
Topic: Helping with homework!
Replies: 6
Views: 1024

Re: Helping with homework!  TOPIC_SOLVED

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
by R515
on Sun Oct 20, 2013 5:01 pm
 
Forum: Intermediate Algebra
Topic: Helping with homework!
Replies: 6
Views: 1024

Re: Helping with homework!  TOPIC_SOLVED

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
by R515
on Mon Oct 21, 2013 3:20 pm
 
Forum: Intermediate Algebra
Topic: Helping with homework!
Replies: 6
Views: 1024

Rearranging formula  TOPIC_SOLVED

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
by R515
on Thu Jan 16, 2014 7:22 pm
 
Forum: Beginning Algebra
Topic: Rearranging formula
Replies: 2
Views: 455

Re: Rearranging formula  TOPIC_SOLVED

Many thanks for the reply,

Mark
by R515
on Fri Jan 17, 2014 3:46 pm
 
Forum: Beginning Algebra
Topic: Rearranging formula
Replies: 2
Views: 455

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