
Arturo O. answered 09/18/18
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Replace x in f(x) with x + 4 to translate 4 units to the left.
Replace x in f(x) with x - 4 to translate 4 units to the right.
Since you want to go left,
f(x) → f(x + 4) = (x + 4) - 5 = x - 1