Which function is a quadratic function? O u(x) = - x + 3x ^ 2 - 8 v(x) = 2x ^ 2 + 8x ^ 3 + 9x y(x) = x ^ 2 + 3x ^ 5 + 4 z(x) = 7x ^ 2 + 2x ^ 3 - 3

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