Explanations;
The coordinate point of the given triangles are:
A = (1, 1)
B = (2, -1)
C = (-2, 0)
If the coordinates are dilated by a scale factor k = 2, the resulting coordinates of the pre-image will be:
A' = 2(1, 1) = (2, 2)
B' = 2(2, -1) = (4, -2)
C' = 2(-2, 0) = (-4, 0)
The resulting dilated figure is as shown: