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partial fractions confusion

Hi all when should you have partial fractions in this form e.g. have A without a denominator and when should you have a denominator under A

Reply 1

Zacken

Original post by JT0121

Hi all when should you have partial fractions in this form e.g. have A without a denominator and when should you have a denominator under A

When the numerator of the fraction is of equal degree to the denominator.

Reply 2

the bear

if the order of the top is less than the order of the underneath you don't need the A on its own.

so if you have ( 3x + 5 )/{x² - 9} you won't have A + ....

( 3x² + 5 )/{x² - 9} you must reduce the order of the top...

Reply 3

KaylaB

Original post by JT0121

Hi all when should you have partial fractions in this form e.g. have A without a denominator and when should you have a denominator under A

Basically if the top is divisible by the denominator, then you end up with something like A + B/(x+1) + C(x-2) ect

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