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factorising quadratic equations

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Original post by RueXO
with my exam board you have polynomials in c1, and quadratics in every module in some form or the other

We have polynomials in C1 but dont have quadratics in any other ones tbh, im not too sure about C2 as i did it last year but im still quite sure we dont have it
Original post by Ayaz789
We have polynomials in C1 but dont have quadratics in any other ones tbh, im not too sure about C2 as i did it last year but im still quite sure we dont have it

I'm pretty sure regardless of what exam board that you do, quadratics will come up either way... I'm pretty sure there's no paper that has not had quadratics in them.
Original post by xColourReign
I'm pretty sure regardless of what exam board that you do, quadratics will come up either way... I'm pretty sure there's no paper that has not had quadratics in them.

We dont have quadratics in the C1 Paper , nor the c3 and c4 paper!
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Original post by Ayaz789
We dont have quadratics in the C1 Paper , nor the c3 and c4 paper!


Heyaa can you please explain how to do this.
I'm finding it a bit hard.

I don't want answer please x
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Original post by z_o_e
Heyaa can you please explain how to do this.
I'm finding it a bit hard.

I don't want answer please x
Posted from TSR Mobile


As long as the total number of girls is 6 more than the boys you can put in any combinations of numbers you want, there's no 1 correct answer for this question
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Original post by Big white
As long as the total number of girls is 6 more than the boys you can put in any combinations of numbers you want, there's no 1 correct answer for this question


Doesn't work.

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Original post by z_o_e


does work

lets assume the number of girls is 26 and the number of boys is 14
Reply 87
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Original post by Big white
does work

lets assume the number of girls is 26 and the number of boys is 14


Oh okayy thanks ":smile:)

This is what the mark scheme states

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Original post by z_o_e
Oh okayy thanks ":smile:)

This is what the mark scheme states

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Ah ok seems alright then
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Original post by z_o_e
Heyaa can you please explain how to do this.
I'm finding it a bit hard.

I don't want answer please x
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You could form simultaneous equation if you ever have doubts, let the empty square in girls column = a
and let the empty square in boys column = b.

click on spoiler if you want the equations

Spoiler

(edited 7 years ago)
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Original post by Icyytea
You need to form simultaneous equation, let the empty square in girls column = a
and let the empty square in boys column = b.

click on spoiler if you want the equations

Spoiler



Ohh tyy so did I do it wrong before?

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Original post by z_o_e
Ohh tyy so did I do it wrong before?

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EDIT yeah I think you did it wrong because the number of girls wasn't 6 more than the boys in the picyou posted but if you did it simultaneously you would get a = 12 and b = 5 which works out
(edited 7 years ago)
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Original post by Icyytea
EDIT yeah I think you did it wrong because the number of girls wasn't 6 more than the boys in the picyou posted but if you did it simultaneously you would get a = 12 and b = 5 which works out


Wb this?


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Original post by z_o_e
Ohh tyy so did I do it wrong before?

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wholly sorry that's my fault, the number of girls should be 6 more than the boys and the difference between the number should be 6
Original post by Icyytea
EDIT yeah I think you did it wrong because the number of girls wasn't 6 more than the boys in the picyou posted but if you did it simultaneously you would get a = 12 and b = 5 which works out

thanks for pointing that out ^-^
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Original post by z_o_e

I don't know what that picture is showing
(edited 7 years ago)
Reply 95
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Original post by Ayaz789
We dont have quadratics in the C1 Paper , nor the c3 and c4 paper!


Yeah we do but they're in different form like sin^2(x) + 2sin(x) +1 = 0
or with e instead

Edit: nvm thought you were talking about Edexcel
(edited 7 years ago)
Original post by z_o_e


No, there isn't really a method for this just common sense. They say that there are 6 more girls than boys. What i like to do here is half the number, to get 20 and then go three up to get 23 and then 3 down to get 17, in this case there are 23 girls and 17 boys, whcihc is the only solution. Any other answer is wrong!
Have you learned the quadratic formula or how to 'complete the square'?

It makes solving tricky polynomials so much easier and quicker, especially when you can use a calculator in the later modules:smile:

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