To get roots of 13 and -3 the simplified equation will have to look like this.
(X-13)(X+3)=0
So if we multiply this out with foil method we get this:
X^2 -10X -39
So the answer is A
This seems to be dividing by 4, so the next numbers are 20, and then 5. If there is a 3rd, it's 1.25
