SOLUTION: P(x) = x^6 − 1 (a) Find all zeros of P, real and complex. (Enter your answers as a comma-separated list. Enter all answers including repetitions.) (b) Factor P completely.

Algebra ->  Real-numbers -> SOLUTION: P(x) = x^6 − 1 (a) Find all zeros of P, real and complex. (Enter your answers as a comma-separated list. Enter all answers including repetitions.) (b) Factor P completely.      Log On


   



Question 1201303: P(x) = x^6 − 1
(a) Find all zeros of P, real and complex. (Enter your answers as a comma-separated list. Enter all answers including repetitions.)
(b) Factor P completely.

Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Step 1,
Factor x^6 - 1.

Answer by ikleyn(52898) About Me  (Show Source):
You can put this solution on YOUR website!
.

The zeros are the roots of degree 6 of 1


    z1 = 1

    z2 = cis%282pi%2F6%29

    z3 = cis%284pi%2F6%29

    z4 = cis%286pi%2F6%29 = -1

    z5 = cis%288pi%2F6%29

    z6 = cis%2810pi%2F6%29


The complete factoring is

    x%5E6-1 = (x-z1)*(x-z2)*(x-z3)*(x-z4)*(x-z5)*(x-z6).

Solved.

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There is a bunch of my lessons on complex numbers
    - Complex numbers and arithmetical operations on them
    - Complex plane
    - Addition and subtraction of complex numbers in complex plane
    - Multiplication and division of complex numbers in complex plane
    - Raising a complex number to an integer power
    - How to take a root of a complex number
    - Solution of the quadratic equation with real coefficients on complex domain
    - How to take a square root of a complex number
    - Solution of the quadratic equation with complex coefficients on complex domain

    - Solved problems on taking roots of complex numbers
    - Solved problems on arithmetic operations on complex numbers
    - Solved problem on taking square root of complex number
    - Miscellaneous problems on complex numbers
    - Advanced problem on complex numbers
    - Solved problems on de'Moivre formula
    - Calculating the sum 1*sin(1°) + 2*sin(2°) + 3*sin(3°) + . . . + 180*sin(180°)
    - A curious example of an equation in complex numbers which HAS NO a solution
    - Solving non-standard equations in complex numbers
    - Determine locus of points using complex numbers
in this site.

Also,  you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic  "Complex numbers".


Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.