A) f is one-one but not onto R
B) f is onto R but not one-one
C) f is one-one and onto R
D) f is neither one-one nor onto R
Correct Answer: C
Solution :
\[f(x)={{x}^{3}}+5x+1\] \[f'(x)=3{{x}^{2}}+5>0\] \[\Rightarrow \]is one-one \[\because \]f is cubic \[\Rightarrow \]f is onto ?f? is one-one and onto.
You need to login to perform this action.
You will be redirected in
3 sec
