Write a function file that creates the following piecewise function: f(x) =    2 x + 1 , x ≤ 2 e x−6 , 2 < x ≤ 4 x x−6 , 4 < x 6= 6 Assume x is a scalar. The function file should contain an if statement to distinguish between the different cases. Also, if the input is x = 6, the function should display "the function is undefined at x = 6". Test your function by evaluating f(1), f(2), f(2.5), f(4), f(6) and f(7)