Question

AL SUMAR 4+5i con 6+5i se obtiene​

Answer 1

(a+bi) • (x+yi)  = ax+by•i^2+(ay+bx)i  

and since  i^2 = -1  it can be written as :

ax - by + (ay + bx) i  

( 4 -  5i) • ( 6 +  5i) =

 ( 49 -  10i)

osea

(4-5i).(6+5i) = (49-10i)