Let
x--------> original image
y-------> modified image
F------> scale factor
we know that
[tex]y=Fx\\ \\F= \frac{y}{x}[/tex]
if the scale factor produce an expansion under a dilation
then
[tex]y > x[/tex]
[tex]\frac{y}{x} > 1\\ \\F > 1[/tex]
therefore
the answer is
[tex]2[/tex] and [tex]3[/tex]