Level:
Project ID:
1003162301
Source Problem:
Accepted:
1
Clonable:
1
Easy:
0
Find all the values of the real parameter \( a \) such that \( f(x)=ax^2-2 \) is decreasing on \( (0,\infty) \).
\( a\in(-\infty,0) \)
\( a\in(0,\infty) \)
\( a\in[2,+\infty) \)
\( a\in(-\infty,2] \)