The scale factor is 4.
A scale factor in math is the ratio between corresponding measurements of an object and a representation of that object. If the scale factor is a whole number, the copy will be larger. If the scale factor is a fraction, the copy will be smaller.Let x---------> measure of the base of the triangle of the image
y---------> measure of the base of the triangle of the pre-image
sf-------> the scale factor
we know that the scale factor is equal to
sf = x/y
according to the problem x = 8
y = 2
Scale factor (sf) = x (8)/y(2)
Scale factor = 4
Hence, sf = 4units
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