 Hello and welcome to this session. Let us discuss the following problem today. Show that the function f from r to r given by fx is equal to x cube is injective. Now let us write the solution. Given to us fx is equal to x cube. Let x1, x2 belongs to r then f of x1 is equal to f of x2 which implies x1 cube is equal to x2 cube which implies x1 is equal to x2 on taking cube root f is 1, 1 from r to itself and hence f is a injective function. If you understood this problem, bye and have a nice day.