Points A, B, C, D, on an Argand diagram, represent the complex numbers 9+i, 4+j 13,-8+j 8,-3-j 4 respectively. Prove that ABCD is a square. | Numerade

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2a 3 marks the complex numbers z1 2 2i and 2z 1 3i are represented by the points a and b respectively on an argand diagram given that 0 is the origin find ab giving your answer in the form a 83925