# Alevel MathsWatch

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#1
Hello, I seem I just cannot get the right answer for partial fraction of 1/(x(x-1)(x+1)) using the cover up rule, would be a massive help if you could do a step by step just so I can see where my mistake is, Thank-you for reading
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1 week ago
#2
Can you show what you have achieved so far?
1
1 week ago
#3
(Original post by Moll.987)
Hello, I seem I just cannot get the right answer for partial fraction of 1/(x(x-1)(x+1)) using the cover up rule, would be a massive help if you could do a step by step just so I can see where my mistake is, Thank-you for reading
Firstly, check that you fully understand the cover up rule, as this question is incredibly easy using it. You are either not using it properly or making a mistake in your mental arithmetic.

Secondly, it's very important that you know how to do these questions by the more general method.

However, just to get you started, for the A/x part you cover up the x and substitute 0, getting A = 1/(-1 x 1) = -1.
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#4
(Original post by dextrous63)
Can you show what you have achieved so far?
Hello, thank you for responding however I have now successfully completed the question
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#5
(Original post by David Getling)
Firstly, check that you fully understand the cover up rule, as this question is incredibly easy using it. You are either not using it properly or making a mistake in your mental arithmetic.

Secondly, it's very important that you know how to do these questions by the more general method.

However, just to get you started, for the A/x part you cover up the x and substitute 0, getting A = 1/(-1 x 1) = -1.
Hello, thank you for replying, I have now done it using the cover up rule, as there was an error in my mental arithmetic
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