1003112005

SubArea: 
Derivative
Level: 
A
Project ID: 
1003112005
Accepted: 
1
Easy: 
1
Given the function \( f(x)=-x^2-4x \), determine all the values of \( x \) (\( x\in\mathbb{R} \)) for which \( f'(x)=0 \).
\( x=-2 \)
\( x=2 \)
\( x=-4 \)
\( x=4 \)
\( x_1=0 \), \( x_2=4 \)