Section Exercises
1. Explain how to add complex numbers. 2. What is the basic principle in multiplication of complex numbers? 3. Give an example to show the product of two imaginary numbers is not always imaginary. 4. What is a characteristic of the plot of a real number in the complex plane? For the following exercises, evaluate the algebraic expressions. 5. , evaluate . 6. , evaluate . 7. , evaluate . 8. , evaluate . 9. , evaluate . 10. , evaluate . For the following exercises, determine the number of real and nonreal solutions for each quadratic function shown. 11.![Graph of a parabola intersecting the real axis.](https://s3-us-west-2.amazonaws.com/courses-images-archive-read-only/wp-content/uploads/sites/924/2016/06/23153622/CNX_Precalc_Figure_03_01_2012.jpg)
![Graph of a parabola not intersecting the real axis.](https://s3-us-west-2.amazonaws.com/courses-images-archive-read-only/wp-content/uploads/sites/924/2016/06/23153656/CNX_Precalc_Figure_03_01_2022.jpg)