A function--namely a parabola (concave up). To "evaluate" this function you would need an x value and would find the resulting y value. To "solve" this function, you would probably be given a y value and asked to find the corresponding x value(s).
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It is a polynomial expression in x. What about it?
x² + x² = 2x²
(x2 - 16) = (x + 4) (x - 4)
x times x to the first power is x to the second power
(x + 2)(x - 4)