What is the equation of a quadratic function whose graph is a downward-opening parabola, has a vertex at (2, -3), and passes through the point (4, -5)?
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What is the integral of e^(2x) with respect to x?
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What is the minimum value of a quadratic function, f(x) = x^2 - 4x + 3, over the interval -∞ to +∞?