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Which of the following curves is concave down ?

\[\begin{array}{1 1}(1)y=-x^{2}&(2)y=x^{2}\\(3)y=e^{x}&(4)y=x^{2}+2x-3\end{array}\]

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is a parabola open downward ad is concave downward.
Hence 1 is the correct answer.
answered May 20, 2014 by meena.p

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