It says one is only 16, Whereas the other portion it says both 2 and -2 what does it mean by this can yous please explain in detail.

or as f(x) =22. 2) For every value of a there is only one value of y. In other words, you can't have two buildings on the same spot. This means y = x2 is a function, but y = vx is not. Why? Let's find the value of a2 and va at a = 4. For the function y = ? y = 16 at x = 4. However, for y = vx, y can be either +2 or -2 at x = 4 At x = 4 there are two possible values of y for the function y = vx, but only one value for y for the function y = x2. In other words, Va is ambiguous between two possible numbers, and x2 is not. That's why a is a function and va is not. Pictorially, this is a function: 100 f (x ) =x2 BD This is a function because for every value of x there is only ONE 60 value of y