The partial fraction decomposition of frac{3x | vedclass

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Question

(A) Let $u = x - 1$,so $x = u + 1$. Substituting this into the numerator: $3(u + 1)^3 - 8(u + 1)^2 + 10$. $= 3(u^3 + 3u^2 + 3u + 1) - 8(u^2 + 2u + 1)

Vedclass · Accepted Answer

$\frac{3}{(x - 1)} + \frac{1}{(x - 1)^2} - \frac{7}{(x - 1)^3} + \frac{5}{(x - 1)^4}$

Vedclass · Answer

(A) Let $u = x - 1$,so $x = u + 1$. Substituting this into the numerator: $3(u + 1)^3 - 8(u + 1)^2 + 10$. $= 3(u^3 + 3u^2 + 3u + 1) - 8(u^2 + 2u + 1) + 10$. $= 3u^3 + 9u^2 + 9u + 3 - 8u^2 - 16u - 8 + 10$. $= 3u^3 + u^2 - 7u + 5$. Now,divide by $u^4$: $\frac{3u^3 + u^2 - 7u + 5}{u^4} = \frac{3}{u} + \frac{1}{u^2} - \frac{7}{u^3} + \frac{5}{u^4}$. Substituting $u = x - 1$ back: $\frac{3}{(x - 1)} + \frac{1}{(x - 1)^2} - \frac{7}{(x - 1)^3} + \frac{5}{(x - 1)^4}$.

The partial fraction decomposition of $\frac{3x^3 - 8x^2 + 10}{(x - 1)^4}$ is:

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