SOLUTION: Write a polynomial function of minimum degree with real coefficients whose zeros include those listed. Write the polynomial in standard form. 5, -3, and -1 + 2i

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Write a polynomial function of minimum degree with real coefficients whose zeros include those listed. Write the polynomial in standard form. 5, -3, and -1 + 2i      Log On


   



Question 1106850: Write a polynomial function of minimum degree with real coefficients whose zeros include those listed. Write the polynomial in standard form.
5, -3, and -1 + 2i

Answer by greenestamps(13198) About Me  (Show Source):
You can put this solution on YOUR website!


If the polynomial is to have real coefficients, then complex roots must occur in conjugate pairs. Since -1+2i is a root, -1-2i must be another root.

The linear factors are (x-5) and (x+3); the quadratic factor corresponding to the two complex roots is (x^2+2x+5). The polynomial in standard form is then

%28x-5%29%28x%2B3%29%28x%5E2%2B2x%2B5%29+=+x%5E4-14x%5E2-40x-75