More Lessons for PreCalculus

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Videos, worksheets, games and activities to help PreCalculus students learn about the conjugate zeros theorem. What is the Conjugate Zeros Theorem or Conjugate Pair Theorem? How to use the Conjugate Zeros Theorem to factor a polynomial?

The Conjugate Zeros Theorem states that if a complex number a + bi is a zero of a polynomial with real coefficients then the complex conjugate of that number, which is a - bi, is also a zero of the polynomial. It is also called the Conjugate Pair Theorem.

We can use the Conjugate Zeros Theorem to help find the zeros of an expanded polynomial. If we are given an imaginary zero, we can use the conjugate zeros theorem to factor the polynomial and find the other zeros.

Conjugate zeros theorem

A discussion of the conjugate zeros theorem for polynomials with real coefficients.

Find a cubic in a factored form with real coefficients, a leading coefficient of 5, and zeros that include 9 and 5i.

Using the conjugate zero theorem for find all of the complex zeros of a polynomial.

Find a cubic polynomial in standard form with real coefficients having zeros -4 and 3 + 2i.

This video shows how to factor a 3rd degree polynomial completely given one known complex root.

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