Question

For what value of x is the rational expression below equal to zero? ​

Answer 1

-5 because then the top would be 0 and bottom is 11. 0 divided by anything is 0

Answer 2

The rational expression will be zero when its numerator is zero and its denominator is NOT zero.  

3x + 15 = 0

3x = -15

x = -5

We check and the denominator 6 - x = 6 - -5 = 11, not zero, good.

Answer: D.  -5