Describe the error made in subtracting the two rational expressions shown:

Answer:

When subtracting rational expressions, it is necessary to subtract all terms in the second numerator, not just the first term. This means the negative sign must be distributed to both the x and the -2. The correct simplified numerator should be (x + 1) - (x - 2) = x + 1 - x + 2, which equals 3. Only subtracting the first term results in an incorrect numerator of -1.