PART B: APPLICATION 2. Find the value (s) of k such that a = (k, -3, 2) and b = (k, k, -5) are perpendicular. [2 marks] 3. What can you conclude about vectors u and v in the following situations? Explain your answer. [2 marks] aux v = 0 b) lux vl = 1ul/ul 4. If AB = (4, -2,3) and BC = (-2, 1, -2), determine the area of AABC. [3 marks]