Answer is in a photo. I can only upload it to a file hosting service. link below!
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Answer:
Reflection across the Y axis
Step-by-step explanation:
If you plot each point of the triangle in its before and after positions you are able to see that the triangle's original shape was reflected across the Y axis to reach its end form.
Think about a rubik's cube rolling if you are struggling with reflections.
If you multiple 128 by 6 you will get your answer of 768.