6. Find all the solutions of the quadretc Irl + Du -blu - ah =0 (1 mark) 7. Ifumn -20 and v = 6 + jb, calculate Refu + v). (1 mark) A 32 8 3/1 8. Ifu = a - 120 and i = 6 + jb, calculate the value of Im (=) (2 marks) 9. Find the argument of a + jb to 3 s! Give your answer in the range -= to m. (2 marks) 10. Use differentiation to find the gradient of the curve y = (a + bx] atx m.1. (2 marks) 11. Evaluate the definite integral [ (a + hx]'dr. (2 marks] 12. Use integration to determine the average value of y's -a x(bix - 1) between * = 0 and x = 1. (2 marks) END ity: Investigate MacBook Air K DII F5 F6 F7 FB % A &