(c) Let f be a function R{3}R{1} with f(x)=x+3x. i. Show that f is a bijective function ii. Find the inverse function f1 iii. Plot the curves of both function f and f1 on the same graph. iv. suppose we change the co-domain of the function f to be R : f:R{3}R v. Is f still a bijective function? Explain your