Question

(UFBA) - Sendo a = -4 + 3i , b = 5 - 6i e c = 4 - 3i , calcule o valor de a.c + b.

Answer 1

-4 + 3i . 4 - 3i + 5 - 6i
-4 +12i -3i +5 -6i
1 +12i -9i
3i = -1
i = -(1/3)

Answer 2

(-4+3i)*(4-3i)+(5-6i)=
(-16+12i+12i-9i²)+5-6i
Sabendo-se que i²=-1 teremos:
(-16+24i-9*(-1))+5-6i
-16+9+24i+5-6i
-7+5+24i-6i
-2+18i