What is the maximum value of the quadratic function f(x) = x^2 over the interval [-∞, ∞]?
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What is the equation for the vertical axis parabola that opens upward and has a positive coefficient a?
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What are the characteristics of a parabola function (𝑦 = 𝑎𝑥²)? Hint: vertex, axis of symmetry, direction of opening, and whether it is a minimum or maximum point.