4 + 3I, On the second floor, I want to see how you solve XY. I have a problem there I can't check it out

4 + 3I, On the second floor, I want to see how you solve XY. I have a problem there I can't check it out

Exhibition unfolds
Left a ^ 2 + B ^ 2I ^ 2 + 2abi = right 4 + 3I
a^2-b^2+2abi=4+3i
a^2-b^2=4,2ab=3
The rest, the genius dog must be able to do, solve the value of a, B
Come on
Can you delete my floor It's a bit dull downstairs]