Math Problem Statement

Найти и изобразить на комплексной плоскости все значения следующих корней: 1) 5√1 ; 2) √-4 ; 3) √-24 - 10j ; 4) 3√1 - j ; 5) (7 - j) / √(-3 + 4j)

Solution

The problem asks to find and plot the roots of the following complex numbers on the complex plane:

  1. 15\sqrt[5]{1} (fifth root of 1)
  2. 4\sqrt{-4} (square root of -4)
  3. 2410j\sqrt{-24 - 10j} (square root of 2410j-24 - 10j)
  4. 1j3\sqrt[3]{1 - j} (cube root of 1j1 - j)
  5. 7j3+4j\frac{7 - j}{\sqrt{-3 + 4j}} (a complex fraction)

Solution Steps:

  1. Fifth Root of 1: 15\sqrt[5]{1} gives 5 roots in total on the unit circle in the complex plane. They are given by e2πik/5e^{2\pi ik / 5} for k=0,1,2,3,4k = 0, 1, 2, 3, 4.

  2. Square Root of -4: 4\sqrt{-4} is 2j2j, because j2=1j^2 = -1, where jj is the imaginary unit.

  3. Square Root of 2410j-24 - 10j: Convert 2410j-24 - 10j to polar form, and use the formula for the square root in polar coordinates.

  4. Cube Root of 1j1 - j: Convert 1j1 - j into polar form, then find its cube roots by dividing the argument by 3.

  5. Complex Fraction 7j3+4j\frac{7 - j}{\sqrt{-3 + 4j}}: First, calculate the square root of 3+4j-3 + 4j and then simplify the fraction.

Would you like a detailed explanation for each step, or just the final answers for these roots?

Related Questions:

  1. How do you convert a complex number into polar form?
  2. What is De Moivre's theorem and how does it apply to roots of unity?
  3. How do you find the cube roots of a complex number?
  4. What is the geometric interpretation of complex roots on the complex plane?
  5. How do you simplify expressions with complex fractions?

Tip:

When plotting complex numbers, their modulus represents the distance from the origin, and their argument represents the angle from the positive real axis.

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Math Problem Analysis

Mathematical Concepts

Complex Numbers
Roots of Unity
Polar Coordinates

Formulas

Roots of unity: e^(2πik / n) for k = 0, 1, ..., n-1
Square root of complex numbers in polar form: √r * (cos(θ/2) + i sin(θ/2))
Cube root of complex numbers: r^(1/3) * (cos(θ/3) + i sin(θ/3))

Theorems

De Moivre's Theorem: (cos θ + i sin θ)^n = cos(nθ) + i sin(nθ)
Polar Form of Complex Numbers

Suitable Grade Level

Grade 11-12