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Easy: A common binomial factor
Factor the numerator and the denominator completely, then cancel factors that appear in both. Only whole factors cancel, never single terms. The excluded values make the original denominator zero, including any factor that was cancelled.
Simplify. State the values of x that are excluded.
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Only common factors cancel, and x + 3 is a sum, not a product. Factor the top and bottom first, then cancel whole factors.
The original expression is undefined wherever its denominator is 0, even if that factor cancels. (x² − 4)/(x − 2) simplifies to x + 2, but x ≠ 2.
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