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Write out the form of the partial fraction decomposition of the function (see example). Do not determine the numerical values of the coefficients.(a)    x3x2 + 6x + 5 (b)    6x + 1(x + 1)3(x2 + 4)2

Question

Write out the form of the partial fraction decomposition of the function (see example). Do not determine the numerical values of the coefficients.(a)    x3x2 + 6x + 5 (b)    6x + 1(x + 1)3(x2 + 4)2

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Solution

(a) For the function x^3/(x^2 + 6x + 5), the denominator can be factored into (x+1)(x+5). The form of the partial fraction decomposition would be:

A/(x+1) + B/(x+5)

(b) For the function (6x + 1)/[(x + 1)^3 * (x^2 + 4)^2], the form of the partial fraction decomposition would be:

A/(x+1) + B/(x+1)^2 + C/(x+1)^3 + D/(x^2+4) + E/(x^2+4)^2

In both cases, A, B, C, D, and E are constants that can be determined by equating coefficients and solving the resulting system of equations.

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