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Adding
Add two rational expressions whose denominators are distinct linear binomials:
Step 1 — Find the LCD and rewrite each fraction. The denominators and are already fully factored and share no common factor, so the LCD is their product: . The first fraction is missing the factor ; the second is missing . Multiply each by the appropriate form of :
Step 2 — Add the numerators over the common denominator. Distribute in each numerator and combine:
Step 3 — Simplify, if possible. The binomial cannot be factored further and shares no common factor with the denominator, so the result is already in simplified form:
This example demonstrates the complete three-step procedure for adding rational expressions with different polynomial denominators. When two linear binomial denominators share no common factor, the LCD is simply their product. After rewriting, the numerators are expanded, combined, and then checked for common factors with the denominator.
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