9. Write the solution in the form a + bi. \small \sqrt{-7} = Answers A. \small \fn_phv \small \sqrt{7} + i B. \small \fn_phv \small \sqrt{7} - i C. 0 - \small \fn_phv \small \sqrt{7}i D. 0 + \small \fn_phv \small \sqrt{7}i Question10. Write the solution in the form a + bi. \small \sqrt{-4}\:(3-\sqrt{-9})= Answers A. 6 + 6i B. -6 + 6i C. 6 - 6i D. -6 - 6i Question11. Find a polynomial function with real coefficients that has these numbers as roots: 4, 0, 3i. Answers A. x4 - 4x3 + 9x2 - 36x B. x3 - 4x2 - 3x + 12 C. x3 - 4x2 + 3x -12 D. x4 - 4x3 - 9x2 + 36x Question12. Find the roots of this function: f (x) = x2 + 2x + 2. Answers A. -1 + \small \sqrt{2} and -1 - \small \sqrt{2} B. -1 + i and -1 - i C. -1 - 2i\small \sqrt{2} and -1 + 2i\small \sqrt{2} D. -1 + 2i and -1 - 2i