Simplifying Complex Numbers

[nycmathguy]

Section 2.4
78 & 80

Question 78

4i^2 - 2i^3

4(-1) - 2(i^2)(i)

-4 - 2(-1)(i)

-4 + 2i

Question 80

(-i)^3

i^3

i^2 • i

Note: i^2 = -1

Answer: - i

You say?

 

[MathLover1]

perfect

 

[nycmathguy]

perfect

So far our precalculus journey is nearly perfect. I just hope you will stay the course and complete the race.