1
z1+z2=-6+3i+8-2i=2+i
z2-z1=8-2i+6-3i=14-5i
z1*z2=(-6+3i)(8-2i)=-48+12i+24i+6=-42+36i
z1/z2=(-6+3i)(8+2i)/(/-2i)(8+2i)=(-48-12i+24i+3)/(64+4)=(-54+12i)/68=
=-27/34+3/17*i
2
z=(5+i)(2-3i)/(2+3i)(2-3i)=(10-15i+2i+3)/(4+9=(13-13i)/13=1-i
3
(4+3i)/(3-4i)-(5-4i)/(4+5i)=(4+3i)(3+4i)/(3-4i)(3+4i)-(5-4i)(4-5i)/(4+5i)(4-5i)=
=(12+16i+9i-12)/(9+16)-(20-25i-16i-20)/(16+25)=15i/15-(-41i)/41=
=i+i=2i
4
t²+196=0
t²=-196
t=-14i
t=14i
x²-2x+10=0
D=4-40=-36
x1=(2-6i)/2=1-3i
x2=1+3i