Question

What value of c is the rational expression below equal to zero? x-4/x-6

Answer 1

Answer: x=4

Steps: (I am assuming your question has a typo in it and by "c" you meant "x")

The rational expression equals zero

`(x-4)/(x-6)=0`

only when the numerator equals 0 (the denominator cannot ever be zero):

`x-4 = 0 \\x = 4`

and that happens only for x=4