Question

What is the value of the rational expression below when x is equal to 3? 12-x/x-6

Answer 1

-3

Explanation:

The given rational expression is
`(12-x)/(x-6)`

In order to find the value of the expression when x = 3, substitute x=3 in this expression.

`(12-3)/(3-6)`

On simplifying numerator and denominator, we get

`(9)/(-3)`

This fraction can be simplified and we get

`-3`

Hence, the value of the expression at x =3 is -3