Which of the following best describes how the graph of f can be obtained from the graph of y=1/x^2?f(x)=-4/x^2.
Chooce the correct answer:
a)reflection over the x axis, verticle stretch by a factor of 4
b)reflection over the y axis, verticle shrink by the factor of 4
c) verticle stretch of -4
d)horizontal shift of 4 units to the right