Question

What is the value of the rational expression x/x2-9 when x = –3?

A. -1/12
B. 0
C. 1/6
D. Undefined

Answer 1

you're answer is D.
-3/-3(2)-9
1(2)-9
2-9
7
so it is D

Answer 2

undefined

Explanation:

the value of the rational expression x/x2-9 when x = –3

Rational expression is
`(x)/(x^2-9)`

To find the value of the rational expression at x=-3 , we plug in -3 for x

`(x)/(x^2-9)`

`(-3)/((-3)^2-9)`

`(-3)/(9-9)`

`(-3)/(0)`

When the denominator becomes 0 then the expression is undefined