Understanding and using complex number notation

Real or imaginary? 

 $\sqrt{49}$ 

• real

• imaginary

• complex

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• -12

• 36i

• -12i

• 12i

• -36

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What letter usually represents an imaginary number?

• a

• i

• j

• x

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Which of the following is a complex number in standard form? Select all that apply.

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 $5-3i\ =\ x+iy\ \ \ \ \ \ Find\ x\ and\ y$  

•  $x=-3\ and\ y=5$  

•  $x=3\ and\ y=-5$  

•  $x=5\ and\ y=-3$  

•  $x=-5\ and\ y=3$  

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2.

• a
• b
• c
• d

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 $u=4-i\ \ and\ v\ =-2+3i$  
Find u - v

•  $6-4i$  

•  $2+2i$  

•  $6+2i$  

•  $2-4i$  

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Every real number is complex number

• True

• False

• Can't say

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 $\sqrt{-25}$  is a real number

• True

• False

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