Mdekzat8ieCarme4
Mdekzat8ieCarme4 Mdekzat8ieCarme4
  • 13-07-2016
  • Mathematics
contestada

if y = 1 i, then y3 − 3y2

Respuesta :

apologiabiology
apologiabiology apologiabiology
  • 13-07-2016
y^3-3y^2

(1+i)^3-3(1+i)^2

remember
(1+i)^3=(1+i)(1+i)^2

(1+i)(1+i)^2-3(1+i)^2
factor out (1+i)^2
(1+i)^2((1+i)-3)
(1+i)^2(1+i-3)
(1+i)^2(i-2)
(1+i)(1+i)(i-2)
(1+2i-1)(i-2)
(2i)(i-2)
-2-4i
Answer Link
olemakpadu
olemakpadu olemakpadu
  • 13-07-2016
y = 1i = i

y³ - 3y² 

(i)³ - 3(i)²             i² = -1,   i³ = i²(i) = -i

i³ - 3i² 

-i - 3(-1)

-i + 3
Answer Link

Otras preguntas

to what degree was the Supreme court responsible for undoing the constitutional gains of reconstruction
Questions 4-8 pls help !!!
i need to graph 15x-10y=20
In a minimum of 100 words. Describe the plot of a problem novel with which you are familiar. Include background information about the characters and setting as
What did the electrician say after fixing a light bulb at the top of the empire state building
the perimeter of a rectangle is 36 meters. If the length of rectangle is 10 meters, what is the width (in meters)?
How did people move from being hunter-gatherers to living in a civilization?
How do you solve 4(k -8) = -32 +4K
Which diagram best shows how fraction bars can be used to evaluate 1/2 divided by 1/4?
Use absolute value to express the distance between -10 and 16 on the number line