Respuesta :
Answer:
Just cross multiply
48+42i-42i-36i
then your final answer is: 48-36i
(7-6i)(7+6i)
Multiply the 7^2=49
Multiple the 6^2=36
49-36i
The i will count as a 1
49-36x1
36x1=36
49+36=85
Multiply the 7^2=49
Multiple the 6^2=36
49-36i
The i will count as a 1
49-36x1
36x1=36
49+36=85