Which translation maps the vertex of the graph of the function f(x) = x2 onto the vertex of the function g(x) = x2 + 2x +1?
right 1 unit
left 1 unit
right 2 units
left 2 units
x

If you observe that

you'll notice that we performed a transformation like

which result in horizontal translations, k units to the left if k is positive, k units to the right if k is negative.

In this case, k=1, so the function is translated 1 unit to the left.