Adding Rational Expressions

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Taught by MrLovellFord
  • Currently 4.0/5 Stars.
9551 views | 1 rating
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Lesson Description:

When adding rational expressions that are in fractional form, the trick is to rewrite those expressions so that they have common denominators. One of the denominators may already have a factor of the other term so you only have to multiply one of the terms by one of the factors in order to get a common denominator. Once you have common denominators, then simplify numerators and combine like terms if possible. Further factoring might or might not be possible.

Questions answered by this video:
  • How do you add 2 rational expressions?
  • How do you add (x + 5)/(x + 3) + (-12x - 4)/(x^2 - 4x - 21)?
  • Staff Review

    • Currently 4.0/5 Stars.
    This lesson goes through a rather complicated example of adding 2 rational expressions with different denominators. One denominator is a simple binomial while the other is a quadratic expression. This problem requires factoring, finding common denominators, and adding expressions. All steps are explained very well.