1003261906

SubArea: 
Analyzing function behavior
Level: 
A
Project ID: 
1003261906
Source Problem: 
2010017803
Accepted: 
1
Clonable: 
1
Easy: 
0
Determine the values of \( a \) and \( b \) (\( a \), \( b \in\mathbb{R} \)) such that the function \[ f(x)=ax^3+bx^2+1 \] has a local extremum of \( 9 \) at \( x=-2 \).
\( a=2 \), \( b=6 \)
\( a=-2 \), \( b = 6 \)
\( a=-2 \), \( b = -6 \)
\( a=2 \), \( b = -6 \)