Question 245857
Did you mean:

(x^2 + 8x + 12)/x^2 + 9x + 14)?

Factoring the numerator and denominator gives:

((x+6)*(x+2))/((x+7)(x+2))

Cancelling the (x+2) factors we have:

(x+6)/x+7)

Since x = -7 makes the denominater 0, -7 is not in the domain.