f(x) shifted left 4 units is represented by f(x - (-4)) = f(x + 4). [-4 because ot was shifted LEFT]
If a function, f(x) is shifted to the left four units, the
function that represents the transformation would be f(x+4). The
correct answer between all the choices given is the third choice or letter C. I
am hoping that this answer has satisfied your query about and it will be able
to help you.