T&T6: Ex3.3 Division of Complex Numbers

What is the complex conjugate of  4-3i?

• A.  1/(4-3i)
• B. 1/(4+3i)
• C.  -4 + 3i
• D.  4 + 3i

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CCSS.HSN.CN.A.3

The complex conjugate for  $-3+2i$  is equal to

•  $3-2i$  

•  $3+2i$  

•  $-3+2i$  

•  $-3-2i$  

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CCSS.HSN.CN.A.3

Find the value for the division of  $\frac{2+9i}{1+2i}$  

•  $\frac{20+5i}{5}$  

•  $\frac{20+5i}{-3}$  

•  $\frac{4+18i}{5}$  

•  $\frac{4-18i}{-5}$  

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CCSS.HSN.CN.A.3

How do you write a complex number?

• a-bi

• a+bi

• ai+b

• ai-b

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CCSS.HSN.CN.A.1

Simplify

• (-10+6i)/17

• (1+50i)/61

• (-23+36i)/25

• (-21+33i)/34

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CCSS.HSN.CN.A.3

3/(4 - i)

• 9i

• -3 +12i

• (12 - 3i) / 4- i

• (12 + 3i) /17

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CCSS.HSN.CN.A.3

3/(4 - i)

• 9i

• -3 +12i

• (12 - 3i) / 4- i

• (12 + 3i) /17

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CCSS.HSN.CN.A.3

The complex conjugate can be found by...

• Changing the sign of both a and b

• Changing the sign of a

• Changing the sign of b

• Switching the a and b values

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CCSS.HSN.CN.A.3

If you are adding two complex numbers you should

• add all the numbers together then divide by 2

• add only the real numbers and subtract the complex numbers

• add only the complex numbers and subtract the real numbers

• add only the real numbers together and then add only the complex numbers together then stop

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CCSS.HSN.CN.A.2

When we simplify divisions of complex numbers we mutliply both the numerator and the denominator by the denominator.

• true

• false

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CCSS.HSN.CN.A.3