1. why is it useful to know the definition of rational expression? explain through an example of your own.

Step-by-step explanation:

Rational expressions are in the form of

Here from the definition it is very important to know that the denominator of a rational expression is never zero.

If the denominator is zero then it becomes undefined.

Let us take an example of a rational expression.

This is a rational expression and it is defined only when

It means that the expression is defined for all real values of x except x =-2

step-by-step explanation:

. your answer will contain x - and y -terms. (1 point) x ( ¿¿ 2 − 7 ) 2 +( y 2 − 9 ) 2 √ ¿ 12. what is the distance from the directrix (the crocodile river) to the point ( x , y )? write this equation. your answer will contain a y -term.

both equations and proportions are better.