Which of the following functions are solutions of the differential equation y" + 6y' + 9y = 0? A. $y(x) = e^{-3x}$ B. $y(x) = -3xe^{3x}$ C. $y(x) = 0$ D. $y(x) = x^2e^{-3x}$ E. $y(x) = xe^{-3x}$ F. $y(x) = e^{3x}$ G. $y(x) = -3x$
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