Posted by **thresea** on Wednesday, October 5, 2011 at 12:18am.

what are rational expressions? Why must we always be mindful of the final value of the denominator in a rational expression? For example, consider the rational expression 3x/(x2 – 16). What values in the denominator must we be mindful of? Explain why.

- algebra -
**Steve**, Wednesday, October 5, 2011 at 5:25am
a rational expression is a fraction where the numerator and denominator are polynomials, such as the example above.

The reason for being careful about the denominator is that if it is zero, the fraction is undefined.

## Answer this Question

## Related Questions

- algebra - Find the LCD for the given rational expressions, and convert each ...
- Algebra - how do you do this - (-7yt)/(3x)=?/(18xyt) Building up the denominator...
- algebra - here is a rational expression, 20+2x/5-x for what value of x is the ...
- Intermediate Algebra - what is the meaning term rational expression Please give ...
- Algebra - Build each rational expression into an equivalent rational expression ...
- algebra - Build each rational expression into an equivalent rational expression ...
- Algebra - -7yt/3x=? /18xyt Build each rational expression into an equivalent ...
- Algebra - Rewrite the rational expression as an equivalent rational expression ...
- Algebra 1--Please, help me! - Find any excluded values of each rational ...
- Algebra - Rewrite the rational expression as an equivalent rational expression ...