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# Maths C3 - F(x) = Q(x) X divisor + remainder.... HELP

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1. Can someone explain the bit below where you're meant to compare the co-efficients?..

Click to enlarge...

(Taken from pg.9 of the Edexcel C3 Modular textbook)
2. (Original post by Philip-flop)
Can someone explain the bit below where you're meant to compare the co-efficients?..

Click to enlarge...

(Taken from pg.9 of the Edexcel C3 Modular textbook)
Yes see the triple lined equal sign? that means exactly the same.

So you compare the coefficients.

For example Ax^2 +Bx 5x^2 +2x

so when we compare the x^2 coefficients we understand that Ax^2 5x^2

so we know A=5

with the textbook just see what multiplies to give every single x^2 terms then set that equal to the x^2 coefficient

you can do that for every single term and sometimes and easier way to do things is you can set x= whatever number to make some 0s so then you can find out that the coefficients are
3. (Original post by jakaloupe)
Yes see the triple lined equal sign? that means exactly the same.

So you compare the coefficients.

For example Ax^2 +Bx 5x^2 +2x

so when we compare the x^2 coefficients we understand that Ax^2 5x^2

so we know A=5

with the textbook just see what multiplies to give every single x^2 terms then set that equal to the x^2 coefficient

you can do that for every single term and sometimes and easier way to do things is you can set x= whatever number to make some 0s so then you can find out that the coefficients are
I still don't understand. How come the numbers you've used are different to the ones in the text book?

How does comparing mean ??
4. (Original post by Philip-flop)
I still don't understand. How come the numbers you've used are different to the ones in the text book?

How does comparing mean ??
that was just an example sorry

ok so we can get the term by multiplying the coefficient of on the left hand side is 1 so A must be 1
5. (Original post by Philip-flop)
I still don't understand. How come the numbers you've used are different to the ones in the text book?

How does comparing mean ??
He said "For example"

The only way to get a cubed term in that multiplication is by multiplying by

and you know that the has a coefficient of 1.
6. (Original post by Philip-flop)
I still don't understand. How come the numbers you've used are different to the ones in the text book?

How does comparing mean ??
Most equations are written as ax^2+bx+c

A is a number representing the coefficient of x^2; B is a number representing the coefficient of X, and C is the Y intercept/final number/whatever you want to call it. If you compare ax^3 against 5x^3, you can see that A will be equal to 5.

I think that's the best explanation I have ;-:
7. (Original post by jakaloupe)
that was just an example sorry

ok so we can get the term by multiplying the coefficient of on the left hand side is 1 so A must be 1
OMG you're amazing. I think I understand it now.

Is what you're explaining just like what is explained in this video?... https://www.youtube.com/watch?v=RNnRoTFA3fc
8. (Original post by Philip-flop)
OMG you're amazing. I think I understand it now.

Is what you're explaining just like what is explained in this video?... https://www.youtube.com/watch?v=RNnRoTFA3fc
yes.... wtf they doing lol?

in that first example see to get all the x terms you have to multiply Ax by 2 and B by x so you get 2A+B=7 where the 7 on the left hand side is the x coefficient

Anyway as long as you understand it's all good.
9. (Original post by jakaloupe)
yes.... wtf they doing lol?

in that first example see to get all the x terms you have to multiply Ax by 2 and B by x so you get 2A+B=7 where the 7 on the left hand side is the x coefficient

Anyway as long as you understand it's all good.
Yes I definitely get it now. Thank you so much for the explanation. It was a rookie mistake but I am feeling much more refreshed today so hopefully I won't be silly again :P
10. (Original post by Philip-flop)
Yes I definitely get it now. Thank you so much for the explanation. It was a rookie mistake but I am feeling much more refreshed today so hopefully I won't be silly again :P
Awesome

(tbh tho i got stuck on this aswell when i first saw it ^-^)

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