To divide rational expressions, multiply the first expression by the reciprocal of the second. Simplify the resulting expression by factoring and canceling common factors.
Step 1: Rewrite the Division as Multiplication
To divide the rational expressions, we multiply the first expression by the reciprocal of the second expression:
\[
\frac{x-3}{4x-4} \div \frac{x+1}{x^2+x-2} = \frac{x-3}{4x-4} \times \frac{x^2+x-2}{x+1}
\]
Step 2: Simplify the Expression
Multiply the numerators and the denominators:
\[
\frac{(x-3)(x^2+x-2)}{(4x-4)(x+1)}
\]
Step 3: Factor and Cancel Common Factors
Factor the quadratic expression in the numerator and the linear expression in the denominator:
\(x^2 + x - 2\) factors to \((x+2)(x-1)\).
\(4x - 4\) factors to \(4(x-1)\).
The expression becomes:
\[
\frac{(x-3)(x+2)(x-1)}{4(x-1)(x+1)}
\]
Cancel the common factor \((x-1)\) from the numerator and the denominator:
\[
\frac{(x-3)(x+2)}{4(x+1)}
\]
Final Answer
The simplified expression is:
\[
\boxed{\frac{x^2 - x - 6}{4(x+1)}}
\]