1310-Notes-Sec-24-big-filled

1310-Notes-Sec-24-big-filled - Math 1310 Class Notes –...

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Unformatted text preview: Math 1310 Class Notes – Section 2.4, Page 1 of 11 Math 1310 Section 2.4 An Introduction to Complex Numbers A complex number is a number that can be written in the form a bi + where a and b are real numbers and 2 1 i = - . We call the number a the real part and we call the number b the imaginary part. If a = 0, the complex number is called a pure imaginary number. Any real number can be written as a complex number with b = 0. • First, you’ll need to be able to classify numbers as real, complex or both. Example 1: Identify each of these numbers as real, complex or both: a. 4 2 i- b. 7 Math 1310 Class Notes – Section 2.4, Page 2 of 11 c. 36- d. 5 • Identify the real part and the imaginary part Example 2: Write in the form a bi + and state the real part and the imaginary part. a. 4 7 2 i + b. 5 9-- Math 1310 Class Notes – Section 2.4, Page 3 of 11 c. 12 Next, you’ll need to be able to find various powers of i . You’ll need to know these 4 powers: 2 3 2 4 2 2 1 1 1 1 1 i i i...
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1310-Notes-Sec-24-big-filled - Math 1310 Class Notes –...

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