Answer:
I can't solve and show it but only tell a method to do it!
So find the zero of the given factor:
i.e.

Now put its value (-1) in the polynomial

Now if the answer comes zero it is a factor.
You'll get your answer!
The scale factor is 4 5.8/1.45=4
Answer:
It's the second one. Press 'Ask For Help' if you need more help on problems