Distance two imaginary numbs

Find the distance between two complex number: z1=(-8+i) and z2=(-1+i).

Correct answer:

d =  7

Step-by-step explanation:

A=(8,1) B=(1,1)  d=z2z1=BA  d=(BxAx)2+(ByAy)2=((1)(8))2+(11)2=7   Verifying Solution:  Imz1=Imz2 d=BxAx=(1)(8)=7

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