Question

If $f(x)=-3x^2$, then f(x) is:

• A. Increasing in (0, ∞), decreasing in (-∞, 0)
• B. Increasing in (-∞, 0), decreasing in [0, ∞)
• C. Increasing in $[-\frac{1}{3},∞)$, decreasing in $(-∞,\frac{-1}{3}]$
• D. Decreasing for all real values of x

Answer 1

Answer: (B)

Increasing in (-∞, 0), decreasing in [0, ∞)

Answer 2

The correct option is(B):Increasing in (-∞, 0), decreasing in [0, ∞)