1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Angelina_Jolie [31]
3 years ago
11

2i^4−5i^3+3i^2+√−81 rewritten in a+bi form?

Mathematics
1 answer:
Margarita [4]3 years ago
5 0

Answer:

-1 + 14i.

Step-by-step explanation:

i^2 = -1.

i^4 = i^2 * i^2

= -1 * -1 = 1.

i^3 = i^2 * i = -i.

√−81 = i√81 = 9i.

So

2i^4−5i^3+3i^2+√−81

= 2 - (5 * -i)  - 3 + 9i

= -1 + 5i + 9i

= -1 + 14i.

You might be interested in
Jane is having difficulty deciding whether to put her savings in the Mystic Bank or in the Four Rivers Bank. Mystic offers a 12%
Ad libitum [116K]
The answer to this question would be <span>B. Mystic
</span><span>

Since the rate should be constant, option C and D wouldn't be true.</span>
If the Four Rivers bank gives 12% per year and Mystic Bank gives 14% per year, it will be 3% per quarter year for Four Rivers Bank and 7% semiannually for Mystic Bank. 
The total rate would become:
Four rivers 103%^4= 1.125
Mystic : 107%^2= 1.145

5 0
3 years ago
Which expression represents "5 times the sum of 4 and y?"
Mkey [24]

Answer:

5 x (4+y)

Step-by-step explanation:

8 0
3 years ago
What is a fraction box
vichka [17]
I don't know exactly what a fraction box is sorry
3 0
3 years ago
Two boys who live 14 miles apart start at noon to walk toward each other at rates of 3 mph and 4 mph respectively. In how many h
aniked [119]
Since you have the answers given, just track their walking.
After one hour, one guy has covered 3mi and the other 4mi, which is in total 7, not 14
After 2 hours, one guy has covered 6mi and the other 8mi, which is 14mi

The algebraic way would be:
3x +4x = 14 *x being the hour
7x = 14
x =2
6 0
4 years ago
Read 2 more answers
if i bottle flip a bottle 17 times and there is a ratio of 2 to 3 of it landing how many times will it land
blondinia [14]
The bottle will land about 11 out of the 17 times
hope i helped ( ಥـْـِـِـِـْಥ)
7 0
3 years ago
Other questions:
  • Which rules of exponents will be used to evaluate this expression? Check all that apply. StartFraction left-brace (negative 8) S
    12·1 answer
  • What's the surface area?
    5·1 answer
  • 38. What is the solution to 2(x - 6) = 14?
    11·2 answers
  • F() = 37. What are the domain and range of f-12)?
    8·1 answer
  • In the construction of a segment congruent to a given segment shown, what is CD?
    7·1 answer
  • Which of the following is rational?
    13·1 answer
  • Find the scale factor.
    9·1 answer
  • PLEASE HELP URGENT!!!!
    9·1 answer
  • Can anyone answer these?
    8·1 answer
  • Please help I have an timer
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!