Partial fraction decomposition

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SUMMARY

The discussion focuses on the method of partial fraction decomposition, specifically for the expressions $$\frac{3x+4}{x^2+3x+2}$$, $$\frac{5x^2+5x+8}{(x+2)(x^2+2)}$$, and $$\frac{x^2+15x+21}{(x+2)^2(x-3)}$$. The first example is solved by factoring the denominator into $(x+1)(x+2)$ and expressing the fraction as $$\frac{2}{x+2}+\frac{1}{x+1}$$. This method is essential for simplifying rational functions in calculus and algebra.

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Jordan1994
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Q3.) Express as partial fractions.

a) $$\frac{3x+4}{x^2+3x+2}$$

b) $$\frac{5x^2+5x+8}{(x+2)\left(x^2+2 \right)}$$

c) $$\frac{x^2+15x+21}{(x+2)^2(x-3)}$$
 
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Let's begin with a). Can you state the form the partial fraction will take?
 
Here's a) without the full method:

$$\begin{align*}
\frac{3x+4}{{{x}^{2}}+3x+2}&=\frac{3x+4}{(x+1)(x+2)} \\
& =\frac{2x+2+x+2}{(x+1)(x+2)} \\
& =\frac{2(x+1)+x+2}{(x+1)(x+2)} \\
& =\frac{2}{x+2}+\frac{1}{x+1}. \\
\end{align*}$$
 

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