Adding Rational Expressions

Adding Rational Expressions
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7854 views, 1 rating - 00:04:59
Part of video series Rational Expressions
Taught by MrLovellFord
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.
  • How do you add 2 rational expressions?
  • How do you add (x + 5)/(x + 3) + (-12x - 4)/(x^2 - 4x - 21)?
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.
  • Currently 4.0/5 Stars.
Reviewed by MathVids Staff on June 01, 2010.
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