Consider a parabola with its axis along the Y-axis. The corresponding function is __-
neither one-one nor onto
From the graph , it can be seen that for every value of y there are 2 corresponding values of x . So the given function is not one-one.
Also f(x) assumes only non-negative values. So, no negative real number in R(co-domain) has its pre-image in domain R.
Therefore, f is not onto as well.