Write Octave commands for each of the following questions: a) Generate a vector x such that x(n)-15e "sin (0.3an) where n-0,1,2,3,4. ...,8. b) Find ALL the roots of the following quadratic equation. 2x2 + 6x +3 = 0 Hint: the root(s) of a quadratic equation, ax? + bx + c = 0 is/are, -b Vb2 + 4ac 2a =) By using "while" loop, calculate the factorial of n, n!= n(n-1)(n-2).....(1) The value n is your last digit of the student ID number, i.e., (See Table 1 below) Last digit of student ID number n 0 9 1 8 2 7 3 6 4 5 5 9 6 8 7 7 8 6 9 5 Table 1. Conversion table of last digit of student ID and n For example, if your student ID. is xxxxxXX8, then n! = 6! = 6(5)(4)(3)(2)(1) = 720