Movement to the left or to the right indicates a change in x-values (x is the horizontal axis). However, if the graph has been translated 7 units to the left, you would indicate it by adding to x, like so:
y = (x + 7)²
It seems counter-intuitive, but when moving to the left, you add to x, and when moving to the right you subtract from x.
Answer:
y = (x + 7)²
