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After translating triangle ABC left 3, down 5, the coordinates become:
A (0, -3)
B (3, -3)
C (0, -1)
Performing a dilation of 4 around the center at the origin:
A (0*4, -3*4) = (0, -12)
B (3*4, -3*4) = (12, -12)
C (0*4, -1*4) = (0, -4)
So the new coordinates of the triangle after translation and dilation are:
A (0, -12)
B (12, -12)
C (0, -4)