The problem asks us to resolve the rational function $\frac{4x-3}{(x+1)^2}$ into partial fractions.

AlgebraPartial FractionsRational FunctionsAlgebraic Manipulation
2025/6/9

1. Problem Description

The problem asks us to resolve the rational function 4x3(x+1)2\frac{4x-3}{(x+1)^2} into partial fractions.

2. Solution Steps

Since the denominator is (x+1)2(x+1)^2, which is a repeated linear factor, we can express the given fraction as:
4x3(x+1)2=Ax+1+B(x+1)2\frac{4x-3}{(x+1)^2} = \frac{A}{x+1} + \frac{B}{(x+1)^2}
To find the values of A and B, we multiply both sides of the equation by (x+1)2(x+1)^2:
4x3=A(x+1)+B4x-3 = A(x+1) + B
4x3=Ax+A+B4x-3 = Ax + A + B
Now we can equate the coefficients of the terms with the same power of xx.
Equating the coefficients of xx, we have:
4=A4 = A
Equating the constant terms, we have:
3=A+B-3 = A + B
Since we know A=4A=4, we can substitute this value into the second equation:
3=4+B-3 = 4 + B
B=34B = -3 - 4
B=7B = -7
Therefore, A=4A = 4 and B=7B = -7. Substituting these values into the partial fraction decomposition, we get:
4x3(x+1)2=4x+1+7(x+1)2\frac{4x-3}{(x+1)^2} = \frac{4}{x+1} + \frac{-7}{(x+1)^2}
4x3(x+1)2=4x+17(x+1)2\frac{4x-3}{(x+1)^2} = \frac{4}{x+1} - \frac{7}{(x+1)^2}

3. Final Answer

The partial fraction decomposition is: 4x+17(x+1)2\frac{4}{x+1} - \frac{7}{(x+1)^2}.

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