Читать книгу SAT Math For Dummies with Online Practice - Mark Zegarelli - Страница 41

The complex numbers are the set of all numbers of the form , where a and b are both real numbers and . Another way to think of this is that a is a real number and bi is an imaginary number.

The complex numbers include the set of real numbers, the set of imaginary numbers, and other values. Like the rational numbers and real numbers, the complex numbers are closed under the basic four operations. They’re also closed under square roots and a variety of other operations.

Very few questions on the SAT require knowledge of the complex numbers. I discuss the specific points you need to know about them in Chapters 12 and 15.