Week 15 : Adding and Subtracting Rational Expressions with Monomial Denominators

The strategies for adding and subtracting rational numbers can be used to add and subtarct rational expressions : write the expressions with common denominator.

For the example :

\frac {2x}{7}\div\frac{5}{3x}

So the non-permissible value is x = 0

A common denominator is 21x

\frac {2x}{7}\div\frac{5}{3x}

= \frac {6x^2+35}{21x}

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