x = int(raw_input("Enetr your value for the first X: "))
y = int(raw_input("Enter your value for the last X: "))
z = int(raw_input("Enter step size wanted: "))
def function(x):
return x**2 +4 * x-4
for i in xrange(x,y,z):
print "f({}) = {}".format(i, function(i))