In the screenshot below, you'll see the correct answer is x = -9 or x = -7. I wrote x = -7 or x = -9 and got it wrong.
I do not understand why one is right and the other is wrong as it doesn't matter which order you write them in the factored expression: (x + 9)(x + 7) = (x + 7)(x + 9), right?
Both of your roots are correct. However, the automatized grading system asked for them in "ascending order." Therefore, for the system to recognize your answers as correct, you would need to put $-9$ in the first box and $-7$ in the second box since $-9<-7$.