3. a. Plot the complex number a = -1 + 2! in the complex plane. for c. Find 21 in polar form. {Use the method of multiplication z r z of complex numbers in polar form as we did in section 8.3.) Plot and label I: on the axes above. cl. Write :1 in its rectangular x + yl form [with no r and 6] by using the formulas x = r cos 9, and v = r cos a. Show how to check that your answer is correct by using FOIL to nd :2