If f(x) = a(x+b)² + c, and a0, what happens to the graph of f(x) when b decreases?

Question

If f(x) = a(x+b)² + c, and a>0, what happens to the graph of f(x) when b decreases?

accessdenied · Answer

f(x) is in vertex form, so x= -b is where the vertex is.  Maybe that would help in understanding what happens as we decrease b.

anonymous · Answer

here are the choices
the graph shifts right
	 b.	the graph shifts left
	 c.	the graph narrows
	 d.	the graph shifts down

accessdenied · Answer

i.e.
  b = 4
  vertex is at x=-4
  b = 3
  vertex is at x= -3
  b = 1
  vertex is at x= -1

it seems as we choose smaller values of b, the vertex moves closer to the origin from the left.