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C1 question help watch

1. I was doing the january 2006 past paper

and i was stuck on question 9a,

also for 10a, im not sure how b is 2 and not 4

Also for question 7d im not how to factorise such large numbers??
2. (Original post by Yousf)
I was doing the january 2006 past paper

and i was stuck on question 9a,

also for 10a, im not sure how b in 2 and not 4

Also for question 7d im not how to factorise such large numbers??
Which exam board?
3. (Original post by usycool1)
Which exam board?

edexcel
4. (Original post by Yousf)
edexcel
Ok:

i was stuck on question 9a,
The equation of the graph is y = (x - 1)(x^2 - 4)

You need to find where it hits the x-axis. That will happen when y = 0 so see if you can work out when that will happen.

also for 10a, im not sure how b in 2 and not 4
Well, what makes you think it's 4?

Also for question 7d im not how to factorise such large numbers??
Simplify it a little bit before you attempt to factorise. Post where you got up to if you're not sure how to and I'll show you.
5. (Original post by usycool1)
Ok:

The equation of the graph is y = (x - 1)(x^2 - 4)

You need to find where it hits the x-axis. That will happen when y = 0 so see if you can work out when that will happen.

I did this but im clueless the markscheme says p is 2 and q is -2

Well, what makes you think it's 4?

Dont we have to half the coeffecient on 2x which gives us 1, then we square which give us -1, to get 3 we need to add 4?

Simplify it a little bit before you attempt to factorise. Post where you got up to if you're not sure how to and I'll show you.
n^2+4n-320=0
6. (Original post by Yousf)
n^2+4n-320=0
Well, you've simplified it as much as you can. There isn't really any good method I can think of apart from just thinking of numbers that would work (it won't be too bad, they won't give anything too hard in C1).

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