Finding Solutions for z in z^2 = a + bi

In summary, to find all solutions for z in the equation z^2 = a + bi, you can let z = x+iy and then solve for x and y by comparing the real and imaginary parts of the expanded equation. This will result in a system of two equations in the two unknowns x and y. One of these equations will be a quadratic in y^2, which can be solved by substituting another variable and then converting back to y.
  • #1
Bubblegum
2
0

Homework Statement



z^2 = a + bi

a = real number
b = real number

find all the solutions for z

Homework Equations





The Attempt at a Solution



(x+y)^2 = a + bi ?
 
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  • #2
Bubblegum said:

Homework Statement



z^2 = a + bi

a = real number
b = real number

find all the solutions for z

Homework Equations


The Attempt at a Solution



(x+y)^2 = a + bi ?

Let z = x+iy

Then

(x+iy)^2 = a+ib.

Expand the LHS and then compare the real parts and imaginary parts. Then what you'll have is a system of two equations in the two unknown x and y.
 
  • #3
I am stuck at:

0= y^4 + ay^2 - b^2/4
 
  • #4
Bubblegum said:
I am stuck at:

0= y^4 + ay^2 - b^2/4

It's a quadratic in y^2. If you're unsure what that means, let some other variable such as m=y2 and then solve for m, and then convert back to y2 and solve for y.
 

FAQ: Finding Solutions for z in z^2 = a + bi

What is an "Nth Root Complex Number"?

An Nth root complex number is a type of complex number that is the solution to the equation xN = a + bi. This means that when you raise the number to the power of N, it will equal a complex number with real and imaginary components.

How do you find the Nth root of a complex number?

To find the Nth root of a complex number, you can use the polar form of the number and apply the Nth root formula. This involves finding the modulus (or distance from the origin) and the argument (or angle) of the complex number, and then taking the Nth root of the modulus and dividing the argument by N.

Can an Nth root of a complex number have multiple values?

Yes, an Nth root of a complex number can have multiple values. This is because complex numbers have an infinite number of roots. For example, the cube roots of 8 are 2, -1 + sqrt(3)i, and -1 - sqrt(3)i.

How do you graph Nth root complex numbers?

To graph Nth root complex numbers, you can plot the points on the complex plane. The real component of the number will be the x-coordinate, and the imaginary component will be the y-coordinate. You can also convert the number to polar form and plot it using the modulus as the radius and the argument as the angle.

What is the difference between Nth root complex numbers and Nth root real numbers?

The main difference between Nth root complex numbers and Nth root real numbers is that complex numbers can have multiple roots, while real numbers only have one root. This is because complex numbers have both a real and imaginary component, while real numbers only have a real component.

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