A

2010012302

Level: 
A
Find the intervals of monotonicity of the quadratic function f(x)=−3x2+2.
The function is increasing on (−∞;0] and decreasing on [0;∞).
The function is increasing on (−∞;2) and decreasing on (2;∞).
The function is increasing on (−∞;23] and decreasing on [23;∞).
The function is decreasing on its domain.