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# factorising quadratic equations watch

1. (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
2. (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.
3. (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!
4. (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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5. (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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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
6. (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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7. (Original post by z_o_e)
Doesn't work.

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does work

lets assume the number of girls is 26 and the number of boys is 14
8. (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 ")

This is what the mark scheme states

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9. (Original post by z_o_e)
Oh okayy thanks ")

This is what the mark scheme states

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Ah ok seems alright then
10. (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:
Show
Now you know that horizonataly 18+3+a+b+2 = 40
Next you know that vertically 9+2+a=6+9+3+b
so solve these then you get answer for the squares then find probability
11. (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:
Show
Now you know that horizonataly 18+3+a+b+2 = 40
Next you know that vertically 9+2+a=6+9+3+b
so solve these then you get answer
Ohh tyy so did I do it wrong before?

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12. (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
13. (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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14. (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 ^-^
15. I don't know what that picture is showing
16. (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
17. 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!
18. 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

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