Which conditions would result in a horizontal shrink of the function f (x) = x2?

Based on the definition of vertical shrink, the graph of y1 (x) should look like the graph of f (x), vertically shrunk by a factor of 1/2. Take a look at the graphs of f (x) and y1 (x). Notice that the x-intercepts have not moved. Function (2), g (x), is a sine function.