Warm up:  QuestionsAnswers  1)  2)

Complex Numbers Lesson 4.8

Square root of a negative real number  Necessary Vocab  Imaginary unit: is the complex number whose square is -1.  So, and

Vocabulary  Imaginary number: any number of the form where a and b are real numbers and Imaginary Part Real Part

More Vocabulary  Complex number: can be written in the form where a and b are real numbers.  Ex: 3 + 5i  Pure imaginary number: can be written in the form, where a=0 and  Ex: 5i

1) Adding and Subtracting Complex Numbers  What is the sum or Difference

2) T.O.O. (Try On Own)

3) Multiplying complex numbers  What is each product?

4) T.O.O: HINT* remember how you multiplied binomials in Algebra 1 (FOIL)

5) One more of multiplying complex numbers Remember difference of Square Binomials?!?

6) Dividing Complex Numbers: lets do this together

7) A little more complex

Now it is your turn  QuestionsAnswers  8) 9)

Mixed Review  QuestionsAnswers  10)  11)  12)

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