Fundamental Theorem of Algebra

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Presentation transcript:

Fundamental Theorem of Algebra Section 4.3 Complex Zeros; Fundamental Theorem of Algebra Copyright © 2013 Pearson Education, Inc. All rights reserved

Use the Conjugate Pairs Theorem Objectives Use the Conjugate Pairs Theorem Find a polynomial function with specified zeros. Find the complex zeros of a polynomial function. Copyright © 2013 Pearson Education, Inc. All rights reserved

Copyright © 2013 Pearson Education, Inc. All rights reserved

Copyright © 2013 Pearson Education, Inc. All rights reserved

Copyright © 2013 Pearson Education, Inc. All rights reserved

A polynomial of degree 5 whose coefficients are real numbers has the zeros –2, –3i, and 2 + 4i. Find the remaining two zeros. Since f has coefficients that are real numbers, complex zeros appear as conjugate pairs. It follows that 3i, the conjugate of –3i, and 2 – 4i, the conjugate of 2 + 4i, are the two remaining zeros. Copyright © 2013 Pearson Education, Inc. All rights reserved

Find a polynomial f of degree 4 whose coefficients are real numbers and that has the zeros 1, 1, 4+i. Since 4 + i is a zero, by the Conjugate Pairs Theorem, 4 – i is also a zero. By the factor theorem: Copyright © 2013 Pearson Education, Inc. All rights reserved

Step 1: The degree of f is 4 so there will be 4 complex zeros. Copyright © 2013 Pearson Education, Inc. All rights reserved

Copyright © 2013 Pearson Education, Inc. All rights reserved

This assignment is short! Do the following AS NEEDED. Homework 4.3 ##1-7 all, 17, 33, 35, 39 This assignment is short! Do the following AS NEEDED. A.6: Real Solutions of Quadratics A.7: Complex Solutions of Quadratics Copyright © 2013 Pearson Education, Inc. All rights reserved