Question

Hi, I'm not sure how to do this problem. A triangle with vertices (2,9),(-5,1), and (1,-4) is dilated by a scale factor of 4. Which matrix expression represents the transformation? Do I multiply the vertices by 4? Here's the possible answers by the way:
A. 4x[2 -5 1]
[9 1 -4]
B. 4x [9 1 -4]
[2 -5 1]
c. 4x [2 9]
[-5 1]
[ 1 4]
D. 4x [ 9 2]
[ 1 -5]
[ 4 1]

Answer 1

may be D