PROGRAMME F7 PARTIAL FRACTIONS.

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PROGRAMME F7 PARTIAL FRACTIONS

Programme F7: Partial fractions Denominators with repeated and quadratic factors

Programme F7: Partial fractions Denominators with repeated and quadratic factors

Programme F7: Partial fractions Consider the following combination of algebraic fractions: The fractions on the left are called the partial fractions of the fraction on the right.

Programme F7: Partial fractions To reverse the process, namely, to separate an algebraic fraction into its partial fractions we proceed as follows. Consider the fraction: Firstly, the denominator is factorized to give:

Programme F7: Partial fractions Next, it is assumed that a partial fraction break down is possible in the form: The assumption is validated by finding the values of A and B.

Programme F7: Partial fractions To find the values of A and B the two partial fractions are added to give:

Programme F7: Partial fractions Since: And since the denominators are identical the numerators must be identical as well. That is:

Programme F7: Partial fractions Consider the identity: Therefore:

Programme F7: Partial fractions For this procedure to be successful the numerator of the original fraction must be of at least one degree less than the degree of the denominator. If this is not the case the original fraction must be reduced by division. For example:

Programme F7: Partial fractions Denominators with repeated and quadratic factors

Programme F7: Partial fractions Denominators with quadratic factors A similar procedure is applied if one of the factors in the denominator is a quadratic. For example: This results in:

Programme F7: Partial fractions Denominators with quadratic factors Equating coefficients of powers of x yields: Three equations in three unknowns with solution:

Programme F7: Partial fractions Denominators with quadratic factors

Programme F7: Partial fractions Denominators with repeated factors Repeated factors in the denominator of the original fraction of the form: give partial fractions of the form:

Programme F7: Partial fractions Denominators with repeated factors Similarly, repeated factors in the denominator of the original fraction of the form: give partial fractions of the form:

Programme F7: Partial fractions Learning outcomes Factorize the denominator of an algebraic fraction into its prime factors Separate an algebraic fraction into its partial fractions Recognise the rules of partial fractions