The problem asks us to simplify the expression $\frac{1}{(x+1)(x+2)} - \frac{5}{(x+2)(x-3)}$.

AlgebraFractional ExpressionsSimplificationAlgebraic ManipulationRational Expressions
2025/4/23

1. Problem Description

The problem asks us to simplify the expression 1(x+1)(x+2)5(x+2)(x3)\frac{1}{(x+1)(x+2)} - \frac{5}{(x+2)(x-3)}.

2. Solution Steps

We need to find a common denominator to combine the two fractions. The least common denominator (LCD) is (x+1)(x+2)(x3)(x+1)(x+2)(x-3).
We rewrite the first fraction with the LCD:
1(x+1)(x+2)=1(x+1)(x+2)(x3)(x3)=x3(x+1)(x+2)(x3)\frac{1}{(x+1)(x+2)} = \frac{1}{(x+1)(x+2)} \cdot \frac{(x-3)}{(x-3)} = \frac{x-3}{(x+1)(x+2)(x-3)}
We rewrite the second fraction with the LCD:
5(x+2)(x3)=5(x+2)(x3)(x+1)(x+1)=5(x+1)(x+1)(x+2)(x3)\frac{5}{(x+2)(x-3)} = \frac{5}{(x+2)(x-3)} \cdot \frac{(x+1)}{(x+1)} = \frac{5(x+1)}{(x+1)(x+2)(x-3)}
Now, we can subtract the two fractions:
x3(x+1)(x+2)(x3)5(x+1)(x+1)(x+2)(x3)=(x3)5(x+1)(x+1)(x+2)(x3)\frac{x-3}{(x+1)(x+2)(x-3)} - \frac{5(x+1)}{(x+1)(x+2)(x-3)} = \frac{(x-3) - 5(x+1)}{(x+1)(x+2)(x-3)}
Simplify the numerator:
x35(x+1)=x35x5=4x8x - 3 - 5(x+1) = x - 3 - 5x - 5 = -4x - 8
So the expression becomes:
4x8(x+1)(x+2)(x3)\frac{-4x - 8}{(x+1)(x+2)(x-3)}
We can factor out a 4-4 from the numerator:
4x8=4(x+2)-4x - 8 = -4(x+2)
Thus, the expression becomes:
4(x+2)(x+1)(x+2)(x3)\frac{-4(x+2)}{(x+1)(x+2)(x-3)}
We can cancel the (x+2)(x+2) term in the numerator and the denominator:
4(x+1)(x3)\frac{-4}{(x+1)(x-3)}

3. Final Answer

4(x+1)(x3)\frac{-4}{(x+1)(x-3)}

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