# 1.5A Polynomial Functions and Complex Zeros

Polynomial functions can have complex zeros when their solutions involve imaginary numbers. Complex zeros always occur in conjugate pairs if the polynomial has real coefficients. This means if a + bi is a zero, then a - bi is also a zero. Understanding complex zeros is crucial for fully solving polynomial equations and for understanding the nature of polynomials.
Polynomial Functions and Complex Zeros

# Polynomial Functions and Complex Zeros

Polynomial functions can have complex zeros when their solutions involve imaginary numbers. Complex zeros always occur in conjugate pairs if the polynomial has real coefficients. This means if a + bi is a zero, then a - bi is also a zero. Understanding complex zeros is crucial for fully solving polynomial equations and for understanding the nature of polynomials.

## Examples

Here are ten examples of polynomial functions and their complex zeros:

1. Function: f(x) = x^2 + 1. Zeros: i, -i
2. Function: f(x) = x^2 + 4. Zeros: 2i, -2i
3. Function: f(x) = x^2 + 9. Zeros: 3i, -3i
4. Function: f(x) = x^2 - 2x + 5. Zeros: 1 + 2i, 1 - 2i
5. Function: f(x) = x^2 + 6x + 10. Zeros: -3 + i, -3 - i
6. Function: f(x) = x^2 - 4x + 13. Zeros: 2 + 3i, 2 - 3i
7. Function: f(x) = x^2 + x + 1. Zeros: -(1/2) + (sqrt(3)/2)i, -(1/2) - (sqrt(3)/2)i
8. Function: f(x) = x^4 + 4. Zeros: sqrt(2)/2 + (sqrt(2)/2)i, -sqrt(2)/2 + (sqrt(2)/2)i, -sqrt(2)/2 - (sqrt(2)/2)i, sqrt(2)/2 - (sqrt(2)/2)i
9. Function: f(x) = x^4 - 10x^2 + 9. Zeros: sqrt(3), -sqrt(3), 3i, -3i
10. Function: f(x) = x^3 - 3x^2 + 4. Zeros: 2, 1 + i, 1 - i

## Packet

 appc_1.5a_packet.pdf

## Practice Solutions

 appc_1.5a_solutions.pdf