Question: is cubic function a inverse?
Answer: IN GENERAL , has NO INVERSE , IF IT IS NOT A ONE-TO-ONE FUNCTION.,because only such functions are invertible. ⑵ BUT if a cubic functionis is of the following form/can be converted to the following form, it is invertible : (i) f(x)=(ax+b)³+c, a≠0 , b,c∈|R, with its natural domain, x∈|R or a reduced domain.