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# C1- Completing the square watch

1. heya i would be gratefl if anyone could help me out with these questions

1)x2(squared)-3x-5=0

2)2x2-7=4x

3)4x2-x=8

4)15-6x-2x2=0

basically these do go into fractions and i kind of got confused when the teacher was explaining it, he did a funny methods i hadnt been taught

Any help much appreciated
2. The methods are exactly the same whether you're using fractions or not.

If you have something like then you can take out the factor of 3 to get . Then you can complete the square on what's inside the bracket separately, and multiply through by 3 at the end.

If the coefficient of is negative, multiply through by -1 as well.
3. Thank you , see i was going wrong because i got the denominator and numerator wrong thanks, do you always put b(second digit) before a(first digit) in turns on the numerator
4. (Original post by nuodai)
The methods are exactly the same whether you're using fractions or not.

If you have something like then you can take out the factor of 3 to get . Then you can complete the square on what's inside the bracket separately, and multiply through by 3 at the end.

If the coefficient of is negative, multiply through by -1 as well.
This isn't my thread but can I borrow you a second?
I've got to complete and i've got to and now i'm kinda stuck...
can you tell me what I do next please, thankyou
5. (Original post by emma363)
This isn't my thread but can I borrow you a second?
I've got to complete and i've got to and now i'm kinda stuck...
can you tell me what I do next please, thankyou
Look at separately and complete the square on that in exactly the same way that you normally would -- don't let the fractions confuse you. Then put it back into the equation (i.e. multiply through by the 5 that you took out) and you're done.
6. (Original post by nuodai)
Look at separately and complete the square on that in exactly the same way that you normally would -- don't let the fractions confuse you. Then put it back into the equation (i.e. multiply through by the 5 that you took out) and you're done.
okay cheers

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