Math Question
![Which of the following functions opens downward?
\[
\begin{array}{c}
y=-2 x^{2}+x+3 \\
f(x)=0.5 x^{2}-x-1
\end{array}
\]](https://d3hlidq5bf9vg0.cloudfront.net/stunitas/0246/4FOeFqqcLWlIV1EJRMF8tUbvfhSX3RyygHQzBW5lmfGdfRNLtAh0XIDDyQjAObAV_q.jpg "Which of the following functions opens downward?
\[
\begin{array}{c}
y=-2 x^{2}+x+3 \\
f(x)=0.5 x^{2}-x-1
\end{array}
\]")
Solution
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