A) 11
B) 13
C) 17
D) All of these
Correct Answer: D
Solution :
\[f\,(x)=-{{x}^{3}}+2a{{x}^{2}}-3bx+c\] |
\[f'\,(x)=-\,3{{x}^{2}}+4a{{x}^{2}}-3b\le 0\] \[\forall \,\,x\] if |
\[16{{a}^{2}}-36b\le 0\] |
\[4{{a}^{2}}\le 9b\] \[\therefore \] \[k\ge 9\] |
You need to login to perform this action.
You will be redirected in
3 sec