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4. (a) Show that if z, is a root of the equation azz + bz + c = 0 where a, b and c are

4. (a) Show that if z, is a root of the equation azz + bz + c = 0 where a, b and c are real, then, z; is also a root. (b) If z1 = 1 - i and zz = 7 + i, find the modulus of ZI+Zz 22-21

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