Question

( Rightarrow-4+2 i+2 i-i^{2} )
( Rightarrow-3+4 i )
( & bar{z}_{1} Rightarrow 2+i )
( therefore frac{z_{1} z_{2}}{z_{1}} Rightarrow-frac{3+4 i}{2+i} )
( Rightarrow frac{-3+4 i}{2+i} times frac{2-i}{2-i} geqslant frac{-2+14}{5}=frac{-2}{5}+frac{1 i}{5} )
( ln left(frac{2,22}{21}right) Rightarrow frac{11}{5} )

# VEMBER Wk 44 - 306-060 112 THURSDAY 3 21=2- i z -241

Solution