intermediate algebra ch 6. 6.1 ex.2

ex.2 Ruling out values for x:

1. the definition of a rational number includes the donominator not equaling to 0. ex. 5/0. or a /-8+8=0, if any combination of numbers=0 in the denominator then it is called undefined. In order for the equation to be considered a rational number the denominator can not =0.

2. ex. 2.

x2-4=0

use factorization:

(x-2)(x+2)=0

with the use of factorization; x-2=0, x+2=0; -2, 0R + 2=0

-2, or +2 can not be used in the denominator.

will be continued later.