The problem asks us to express the given rational expression, $\frac{4x-9}{(x-2)(x-3)}$, as a sum of partial fractions. We assume the form $\frac{A}{x-2} + \frac{B}{x-3}$, where $A$ and $B$ are constants we need to find.

AlgebraPartial FractionsRational ExpressionsAlgebraic Manipulation
2025/3/17

1. Problem Description

The problem asks us to express the given rational expression, 4x9(x2)(x3)\frac{4x-9}{(x-2)(x-3)}, as a sum of partial fractions. We assume the form Ax2+Bx3\frac{A}{x-2} + \frac{B}{x-3}, where AA and BB are constants we need to find.

2. Solution Steps

We want to express 4x9(x2)(x3)\frac{4x-9}{(x-2)(x-3)} in the form Ax2+Bx3\frac{A}{x-2} + \frac{B}{x-3}.
First, we write
4x9(x2)(x3)=Ax2+Bx3\frac{4x-9}{(x-2)(x-3)} = \frac{A}{x-2} + \frac{B}{x-3}
Then, we multiply both sides by (x2)(x3)(x-2)(x-3) to get
4x9=A(x3)+B(x2)4x-9 = A(x-3) + B(x-2)
Now, we solve for AA and BB.
Let x=2x = 2. Then 4(2)9=A(23)+B(22)4(2) - 9 = A(2-3) + B(2-2), which gives 89=A8 - 9 = -A, so 1=A-1 = -A, and A=1A = 1.
Let x=3x = 3. Then 4(3)9=A(33)+B(32)4(3) - 9 = A(3-3) + B(3-2), which gives 129=B12 - 9 = B, so 3=B3 = B, and B=3B = 3.
Therefore,
4x9(x2)(x3)=1x2+3x3\frac{4x-9}{(x-2)(x-3)} = \frac{1}{x-2} + \frac{3}{x-3}

3. Final Answer

1x2+3x3\frac{1}{x-2} + \frac{3}{x-3}

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