z1²-z1*z2=z1(z1-z2)=(6+2i)(6+2i-5-3i)= (6+2i)(1-i)=6-6i+2i-2i²= 6 -4i + 2= 8-4i
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z1²-z1*z2=z1(z1-z2)=(6+2i)(6+2i-5-3i)= (6+2i)(1-i)=6-6i+2i-2i²= 6 -4i + 2= 8-4i