Respuesta :

Answer:

40-57i+20i2

Step-by-step explanation:

mathstudent55

Answer:

20 - 57i

Step-by-step explanation:

(-5 + 4i)(-8 + 5i) =

Multiply the complex numbers as you'd multiply two binomials.

= 40 - 25i - 32i + 20i^2

Remember that i^2 = -1.

= 40 - 57i + 20(-1)

= 40 - 57i - 20

= 20 - 57i