A student says that you can reduce the 8 and the x from the following expression: 2x-8 / x^2 -6 + 8 and get 2/x-6. Why is this incorrect?

whosmans Oct 18, 2018

#1**+1 **

1 is in the domain of both functions....so....subbing any number in the domain into both fumctions should make them equal

So

[ 2 (1) - 8 ] / [ 1^2 - 6 - 8 ] = ??? 2 / [ 1 - 6]

[ - 5 ] / [ - 13 ] = ??? 2 / -5

5/13 = ??? - 2/5

Not true...so......these functions are not equal

CPhill Oct 18, 2018