jalmar13 jalmar13
  • 21-11-2020
  • Mathematics
contestada

Please help me solve these!!

Please help me solve these class=

Respuesta :

s1m1
s1m1 s1m1
  • 21-11-2020

Answer:

18i, -7-i, -6+18i

Step-by-step explanation:

1. √-324

first take out the negative as √-1=i

√-324= i√324

324 =2*162

324=2*2*81

324=2*2*9*9

i√324=i√2*2*9*9= i* 2*9= 18i

3.

-4+7i-3-8i combine like terms

-4-3 -8i+7i = -7-i

5.

(1+5i)(4-2i) distribute

1*4 -1*2i +5i*4 -5i*(-2i) multiply

4 -2i +20i +10i² but i²= -1 so

4 -2i +20i -10 combine like terms

-6 +18i

Answer Link

Otras preguntas

Humans have used rocks in the creation of tools and building materials.
Rectangle ABCD and right triangle DCE have the same area. They are joined to form a trapezoid, as shown. What is DE?
What are advantages and disadvantages of farm assured foods?
The most effective technique for including character, setting, and sound description in a short story is to _____.
Bruce rents snowmobiles to tourists. He charges $135 for 4 hours and $202.50 for 6 hours. What is the hourly rate Bruce charges to rent a snowmobile? Hourly Rat
Lilian,max and nazia share a sum of money in the ratio 2:3:5, what fraction of the money does max receive?
how is kinetic energy of an object determined?
What are some side effects for eating disorder? How can you tell if somebody has it?
Patrician or Plebeian? Were the wealthiest members of society. Controlled trade and the military. Patrician Plebeian
Where do the Maori live? A. Australia B. New Zealand C. Hawaii D. Easter Island