Multiplying Dividing Complex Numbers

• A
• B
• C
• D

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CCSS.HSN.CN.A.3

(i)(-3i)(5i)

• 15i

• -15i

• -15i³

• 15i³

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CCSS.HSN.CN.A.2

(2i)(3i)

• 5i

• -5

• 6i

• -6

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CCSS.HSN.CN.A.2

-2/(5-i)

• (-10-2i)/26

• -2i

• -5-i

• (-5-i)/13

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CCSS.HSN.CN.A.3

(1+8i)/(2-4i)

• (-3+2i)/2

• (-30+20i)/20

• -3+2i

• (1+8i)/(2-4i)

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CCSS.HSN.CN.A.3

• A
• B
• C
• D

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CCSS.HSN.CN.A.3

When dividing 2 complex numbers you must 
(check all that apply)

• Multiply by the numerator and denominator by the denominator

• Identify the conjugate of the denominator

• Know the conjugate of the numerator

• Remember no answer can be left with  i^2

• Multiply numerator and denominator by the conjugate of the denominator.
  
  

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CCSS.HSN.CN.A.3

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• 
• 
• 

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CCSS.HSN.CN.A.3

Multiply 2i(3-8i)

• 16-6i1

• 16+6i

• 6i-16i²

• 6i+16i²

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CCSS.HSN.CN.A.2

(7-5i)(7+5i)

• 74

• 75

• 74-1

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CCSS.HSN.CN.C.8