Example

Adding x2+8xx+5+15x+5\frac{x^2+8x}{x+5} + \frac{15}{x+5}

To simplify the sum x2+8xx+5+15x+5\frac{x^2+8x}{x+5} + \frac{15}{x+5}, follow the procedure for adding rational expressions with a common denominator.

Step 1 — Add the numerators. Combine the numerators over the shared denominator x+5x+5: x2+8x+15x+5\frac{x^2+8x+15}{x+5}

Step 2 — Factor the numerator. The trinomial x2+8x+15x^2+8x+15 factors into (x+3)(x+5)(x+3)(x+5): (x+3)(x+5)x+5\frac{(x+3)(x+5)}{x+5}

Step 3 — Simplify. Divide out the common factor (x+5)(x+5) from the numerator and denominator: x+3x+3

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Updated 2026-04-30

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Ch.7 Rational Expressions and Functions - Intermediate Algebra @ OpenStax

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