Further Maths A-Level Topic

Does anyone know where this idea comes from? I've never seen this before

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Does anyone know where this idea comes from? I've never seen this before

Essentially partial fraction decomposition. Core 4.

Essentially partial fraction decomposition. Core 4.

I'm on about the factorial removal I don't get how or ever seen it

I'm on about the factorial removal I don't get how or ever seen it

Well you just need to know your factorial for that, nothing fancy here.

\dfrac{1}{(r+2)r!} = \dfrac{A}{(r+1)!} + \dfrac{B}{(r+2)!} = \dfrac{A}{(r+1)r!} + \dfrac{B}{(r+2)(r+1)r!}

Now mult both sides by

(r+2)r!

and you land on what they got.

thx

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