1. Stating the problem: We want to decompose the rational expression $$\frac{5x+1}{(2x+1)^2}$$ into partial fractions of the form $$\frac{A}{2x+1} + \frac{B}{(2x+1)^2}$$.
2. Formula and rules: For repeated linear factors like $$(2x+1)^2$$, the partial fraction decomposition includes terms with denominators $$(2x+1)$$ and $$(2x+1)^2$$.
3. Set up the equation:
$$\frac{5x+1}{(2x+1)^2} = \frac{A}{2x+1} + \frac{B}{(2x+1)^2}$$
Multiply both sides by $$(2x+1)^2$$ to clear denominators:
$$5x+1 = A(2x+1) + B$$
4. Expand the right side:
$$5x+1 = 2Ax + A + B$$
5. Equate coefficients of like terms:
- Coefficient of $x$: $$5 = 2A$$
- Constant term: $$1 = A + B$$
6. Solve for $A$:
$$A = \frac{5}{2}$$
7. Substitute $A$ into the constant term equation:
$$1 = \frac{5}{2} + B$$
8. Solve for $B$:
$$B = 1 - \frac{5}{2} = \frac{2}{2} - \frac{5}{2} = -\frac{3}{2}$$
9. Final answer:
$$\frac{5x+1}{(2x+1)^2} = \frac{\frac{5}{2}}{2x+1} + \frac{-\frac{3}{2}}{(2x+1)^2} = \frac{5/2}{2x+1} - \frac{3/2}{(2x+1)^2}$$
Partial Fractions 5F7Ec8
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