What are the rules to make partial fractions?
I've got four in my book but sometimes i don't get the answer by simply following the rule this happens especially with substitution method of Partial fractions of A and B.
I've got four in my book but sometimes i don't get the answer by simply following the rule this happens especially with substitution method of Partial fractions of A and B.
1 Answer
Be careful, it can be a little complicated
I'll go through a few examples since there are countless problems with their own solution.
Say we have
We need to write it as a sum.
For example,
Or, we have
For example,
The next bit can't be written as a generalised formula, but you have to follow simple fraction addition to combine all the fractions into one.
Then you multiply both sides by the denominator which leaves you with
Now, you have to use values of
For example:
Now, find a value for
Now, find a value for
Just use any value for
Put your values for