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Complex Numbers Lesson - Adding, Subtracting, Multiplying, and Dividing

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  1. HW:Pg253 #8-12, 19-26 Warm up: • Questions Answers • 1) • 2)

  2. Complex Numbers Lesson 4.8

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

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

  5. 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

  6. 1) Adding and Subtracting Complex Numbers • What is the sum or Difference

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

  8. 3) Multiplying complex numbers • What is each product?

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

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

  11. 6) Dividing Complex Numbers: lets do this together

  12. 7) A little more complex

  13. Now it is your turn • Questions Answers • 8) 9)

  14. Mixed Review • Questions Answers • 10) • 11) • 12)

  15. More math Jokes

  16. Homework Pg 253 #8-12, 19-26

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