Adding and Subtracting Complex Numbers

Simplify the expression:
 $\left(1\ +\ 5i\right)\ +\ \left(1\ -\ 5i\right)$  

•  $2\ +\ 10i$  

•  $2\ +\ 10i^2$  

•  $2$  

•  $-8$  

Tags

CCSS.HSN.CN.A.1

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.1

CCSS.HSN.CN.A.2

Simplify the expression:
 $\left(5\ +\ 14i\right)\ -\ \left(10\ +\ 2i\right)$  

•  $5\ -16i$  

•  $-5\ +\ 16i$  

•  $5\ -\ 12i$  

•  $-5\ +\ 12i$  

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

Simplify the expression:
 $\left(5\ +\ 4i\right)\ -\ \left(-1\ -\ 2i\right)$  

•  $6\ +6i$  

•  $4\ +\ 2i$  

•  $6\ -\ 6i$  

•  $4\ -\ 2i$  

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

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

• 1

• -1

• i

• 0

Tags

CCSS.HSN.CN.A.1

• 10

• -10

• +10i

• -10i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

CCSS.HSN.CN.B.4

CCSS.HSN.CN.B.5

What does i² =  ?

• 1
• -1
• √-1
• √1

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

Simplify

• 5i
• -5i
• ±5i
• ±

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2

-6i - 2i

• 4i

• - 4i

• - 8i

• 8i

Tags

CCSS.HSN.CN.A.2

3i - 5i

• 2i

• - 2i

• - 8i

• 8i

Tags

CCSS.HSN.CN.A.1

CCSS.HSN.CN.A.2