Continue..... power function At u
If n — integer, power functions have a meaning also at
x < O, but their graphs have different forms depending on
that is n an even or an odd number. In Fig. 1.16 two such
power functions are shown: for n = 2 and n = 3.
At n = 2 the function is even and its graph is symrnetric
relatively an axis Y; at n = 3 the function is odd and its graph
is symmetric relatively an origin of coordinates. The func-
tion y = x is called a cubic parabola.
On Fig. 1.17 the function y = ±N/G is represented. This
function is inverse to the quadratic parabola y = x2, its graph
is received by rotating the quadratic parabola graph around
a bisector of the I -st coordinate angle. We see by the graph.