Explanation:
since z=v/I where v=7+8i and I=5i
z=7+8i/5i
according to complex number 1/i=-i
so we have
z=-i(7+8i)/5
=(-7i-8i²)/5
from complex number i²=-1
we have
z=(-7i-(-8))/5
z =(-7i+8)/5
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