Question

sendo a = -4 + 31, b= 5 - 6i e c = 4 - 3i, calcule o valor de ac + b.

Answer 1

$a.c=(-4+3i)(4-3i)=-16+12i+12i-9(i^2)=-7+24i$

$ac+b=-7+24i+5-6i=-2+18i$

Answer 2

 a = -4 + 31, b= 5 - 6i e c = 4 - 3i

 ac + b.

( - 4 + 3i)( 4 - 3i ) +  5 - 6i 

 - 16 + 12i + 12i - 9i^2 + 5 - 6i
24i-6i -16 + 5 + 9
        18i - 2