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
grigory [225]
1 year ago
12

Solve the following equation:

Mathematics
1 answer:
Rama09 [41]1 year ago
3 0

Complete the square.

z^4 + z^2 - i\sqrt 3 = \left(z^2 + \dfrac12\right)^2 - \dfrac14 - i\sqrt3 = 0

\left(z^2 + \dfrac12\right)^2 = \dfrac{1 + 4\sqrt3\,i}4

Use de Moivre's theorem to compute the square roots of the right side.

w = \dfrac{1 + 4\sqrt3\,i}4 = \dfrac74 \exp\left(i \tan^{-1}(4\sqrt3)\right)

\implies w^{1/2} = \pm \dfrac{\sqrt7}2 \exp\left(\dfrac i2 \tan^{-1}(4\sqrt3)\right) = \pm \dfrac{2+\sqrt3\,i}2

Now, taking square roots on both sides, we have

z^2 + \dfrac12 = \pm w^{1/2}

z^2 = \dfrac{1+\sqrt3\,i}2 \text{ or } z^2 = -\dfrac{3+\sqrt3\,i}2

Use de Moivre's theorem again to take square roots on both sides.

w_1 = \dfrac{1+\sqrt3\,i}2 = \exp\left(i\dfrac\pi3\right)

\implies z = {w_1}^{1/2} = \pm \exp\left(i\dfrac\pi6\right) = \boxed{\pm \dfrac{\sqrt3 + i}2}

w_2 = -\dfrac{3+\sqrt3\,i}2 = \sqrt3 \, \exp\left(-i \dfrac{5\pi}6\right)

\implies z = {w_2}^{1/2} = \boxed{\pm \sqrt[4]{3} \, \exp\left(-i\dfrac{5\pi}{12}\right)}

You might be interested in
Which word sentence represents the equation?
Pavlova-9 [17]
<span>Hello :)

6(x+3)=(x+3)+(x+3)+(x+3)+(x+3)+(x+3)+(x+3)
Six times some number plus 3 is 42.</span>
8 0
3 years ago
Read 2 more answers
Perform the operation.(−5x −9x+6)+(6x +10)
a_sh-v [17]

Answer:

-10x + 16

Step-by-step explanation:

Combine Like terms

8 0
3 years ago
A large swimming pool has a perimeter of 1,004 meters, this rectangular-shaped pool is 40 meters longer than 5 times its width.
ANEK [815]
Width is 996 hope its right only in 9th soooooo
4 0
3 years ago
One week a computer store sold total of 36 computers and external drives. The revenue from these sales were $23490. If computers
yarga [219]

Answer:

X = 18

Y = 18

Step-by-step explanation:

first make two equation like

x + y = 36

1180x + 125y = 23490

from equation one we have

y = 36- x

put in second equation

1180x + 125 (36-x) = 23490

1180x + 4500-125x = 23490

1055x = 23490-4500

x = 18990/1055

x = 18

put this x value in equation 1 to find y value

18+ y = 36

y = 36-18

y = 18

5 0
2 years ago
A student performed the following steps to find the solution to the equation x^2 + 14x + 40 = 0. Where did the student go wrong?
Alja [10]

Answer:

A. in Step 3

Step-by-step explanation:

It is factored correctly. Then separated into two smaller equations correctly. But in solving x + 10 = 0, there is an error.

x + 10 = 0

Add -10 to both sides.

x = -10

So, the error is in step 3.

3 0
2 years ago
Read 2 more answers
Other questions:
  • Suppose you purchase sunglasses that are regularly priced at $87.20. They are on sale for 30% off, and you have a coupon for 10%
    5·1 answer
  • Find all angles between 0 and 2π satisfying the condition sinx=−√2/2.
    12·1 answer
  • Please help what are the slope and the y intercept of the linear function that is represented by the table?
    8·1 answer
  • Which points are solutions to the linear inequality y &lt; 0.5x + 2
    8·2 answers
  • Point T is on line segment \overline{SU} SU . Given ST=2x+6,ST=2x+6, TU=4,TU=4, and SU=4x,SU=4x, determine the numerical length
    5·2 answers
  • Based on historical data, your manager believes that 30% of the company's orders come from first-time customers. A random sample
    13·2 answers
  • What is the solution of the following systems of equations? y = 1/2x <br> y = -x -3
    14·1 answer
  • Plz help me im stuck
    14·1 answer
  • The volume of a cube is 125 cm cube.
    11·1 answer
  • What is 10 times as much as 30
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!