Here's the question you clicked on:
Adam555
is y = x^2 - 2x a function (please include solution)
Yes, because it assigns every value x one unique y value.
not unique, but one and only one y-value
:-D thats what unique means dude
Not true. A function that assigns range values uniquely is a one to one function, this function is not one to one, but does assign exactly one range to each domain. Basic definition of function in x.