1. (4-3i)i=4i-3(i^2)=3+4i
2. i(4-3i)i(4+3I)=(i^2)*(16-9(i^2))=-1*(16+9)=-25
3. (4-3i)(-4+3i)=-16+12i+12i-9(i^2)=-7+24i
4.(1-2i)(1+i)=1+i-2i-2(i^2)=1-i+2=3-i
1. (4-3i)i=4i-3(i^2)=3+4i
2. i(4-3i)i(4+3I)=(i^2)*(16-9(i^2))=-1*(16+9)=-25
3. (4-3i)(-4+3i)=-16+12i+12i-9(i^2)=-7+24i
4.(1-2i)(1+i)=1+i-2i-2(i^2)=1-i+2=3-i