Using the parent function y = x^2 match the transformation with the correct equation.
shift 4 units up
shift 4 units down
shift 4 units to the right
shift 4 units to the left
shift 4 units up: y = x^2 + 4
shift 4 units down: y = x^2 - 4
shift 4 units to the right: y = (x - 4)^2
shift 4 units to the left: y = (x + 4)^2