Unit 5 Quiz (Complex Numbers)

Another way to express  $\sqrt{-1}$ is... 

• 1

• -1

•  $i$  

• 0

Tags

CCSS.HSN.CN.A.1

Another way to express  $i^2$  is...

• 1

• -1

•  $i$  

•  $-i$  

Tags

CCSS.HSN.CN.A.1

Simplify  $2i\left(4\ +\ 3i\right)$  

(Show work to justify your answer)

•  $-6\ +\ 8i$  

•  $6\ +\ 8i$  

•  $-6i\ +\ 8i$  

•  $-1\ +\ 8i$  

Tags

CCSS.HSN.CN.A.2

Which expression is equivalent to $\left(3-\sqrt{-1}\right)\left(4\ +\ \sqrt{-25}\right)$ ? 

•  $\left(3-i\right)\left(4\ +\ 5i\right)$  

•  $\left(3\ -1\right)\left(4\ +5\right)$  

•  $\left(3\ -i\right)\left(4-5i\right)$  

•  $\left(3\ +i\right)\left(4\ -5i\right)$  

Tags

CCSS.HSN.CN.A.1

Simplify $\left(-2\ +\ 7i\right)\left(4\ -\ 2i\right)$  

(Show work to justify your answer)

•  $6+\ 32i$  

•  $-6\ +\ 32i$  

•  $22+32i$  

•  $6\ +\ 24i$  

Tags

CCSS.HSN.CN.A.2

Simplify the expression:
 $\left(8\ +\ 9i\right)\ +\ \left(4\ -\ 6i\right)$  

•  $17\ +\ 3i$  

•  $12\ +\ 3i^2$  

•  $17\ -2i$  

•  $12\ +\ 3i$  

Tags

CCSS.HSN.CN.A.2

What is the complex conjugate of  $5-2i$ ? 

•  $\frac{1}{5-2i}$  

•  $\frac{1}{5+2i}$  

•  $-5+2i$  

•  $5+2i$  

Tags

CCSS.HSN.CN.A.3

Simplify $4i\left(-2-8i\right)$  

(Show work to justify your answer)

Tags

CCSS.HSN.CN.A.2

Which is the conjugate of $3-4i$  ?

•  $3-4i$  

•  $3+4i$  

•  $-3-4i$  

•  $-i$  

Tags

CCSS.HSN.CN.A.3

Where is point B located?

• 2 + i

• -3

• 2i

• -1 - i

Tags

CCSS.HSN.CN.B.4