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Questions  

If z1,z2  are two complex numbers such that z1=z2=2  and z1+z2=3 than z1z2 equals;

a
22
b
5
c
3
d
2−2

detailed solution

Correct option is B

z1+z22+z1−z22=2z12+2z22⇒ 3+z1−z22=2(2)+2(2)⇒ z1−z22=5⇒z1−z2=5

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