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# Partial Fractions watch

1. Solve (2x/x+1)- (x+7/x^2-x-2) can be written in form A -B/x-2.
I did long division and got A is 2 but i have no idea how to get B after that, because i am left with a quadratic on top and cubic on the bottom after the long division
2. (Original post by Nirm)
Solve (2x/x+1)- (x+7/x^2-x-2) can be written in form A-B/x-2.
I did long division and got A is 2 but i have no idea how to get B after that, because i am left with a quadratic on top and cubic on the bottom after the long division
Can you post your working up to the point you get stuck?
3. (Original post by notnek)
Can you post your working up to the point you get stuck?
Okay so i do: 2x^3 -3x^2 -12x -7 divided by x^3 -3x -2 and end up with 2 remainder -3x^2 -6x -7. Now i have no idea what to do basically.

( I am doing Double)Maths is such a big jump from Gcse to A-levels
4. (Original post by Nirm)
Okay so i do: 2x^3 -3x^2 -12x -7 divided by x^3 -3x -2 and end up with 2 remainder -3x^2 -6x -7. Now i have no idea what to do basically.

( I am doing Double)Maths is such a big jump from Gcse to A-levels
You are subtracting the fractions by cross multiplying but that isn't always the most efficient way. Factorising gives

Try subtracting them again without just cross multiplying.

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Updated: December 1, 2014
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