A) \[(-\infty ,\,\,-4]\] \[{{x}^{3}}+6{{x}^{2}}+6\]
B) \[\left( -\infty ,\frac{1}{3} \right]\] \[3{{x}^{2}}-2x+1\]
C) \[[2,\,\infty )\] \[2{{x}^{3}}-3{{x}^{2}}-12{{x}^{4}}-6\]
D) \[(-\infty ,\infty )\] \[{{x}^{3}}-3{{x}^{2}}+3x+3\]
Correct Answer: B
Solution :
Let On differentiating w.r.t.we get Forto be increasing \[f'(x)>0\] Let This is wrong. Hence, option (b) is correct.You need to login to perform this action.
You will be redirected in
3 sec