The problem is to decompose the rational function $\frac{4x-9}{(x-2)(x-3)}$ into partial fractions.

AlgebraPartial FractionsRational FunctionsAlgebraic Manipulation
2025/3/24

1. Problem Description

The problem is to decompose the rational function 4x9(x2)(x3)\frac{4x-9}{(x-2)(x-3)} into partial fractions.

2. Solution Steps

We want to decompose 4x9(x2)(x3)\frac{4x-9}{(x-2)(x-3)} into the form Ax2+Bx3\frac{A}{x-2} + \frac{B}{x-3}.
So, we have
4x9(x2)(x3)=Ax2+Bx3\frac{4x-9}{(x-2)(x-3)} = \frac{A}{x-2} + \frac{B}{x-3}.
Multiplying both sides by (x2)(x3)(x-2)(x-3), we get
4x9=A(x3)+B(x2)4x-9 = A(x-3) + B(x-2).
We can solve for AA and BB by substituting suitable values of xx.
Let x=2x=2. Then
4(2)9=A(23)+B(22)4(2) - 9 = A(2-3) + B(2-2)
89=A(1)+08 - 9 = A(-1) + 0
1=A-1 = -A
A=1A = 1.
Let x=3x=3. Then
4(3)9=A(33)+B(32)4(3) - 9 = A(3-3) + B(3-2)
129=0+B(1)12 - 9 = 0 + B(1)
3=B3 = B
B=3B = 3.
Thus, we have
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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