Complex Number Operations

Simplify the expressin. $\left(4+i\right)+\left(7-5i\right)$   

•  $11+4i$  

•  $11-4i$  

•  $-11+4i$  

•  $-11-4i$  

Simplify the expression

 $\left(2-4i\right)\left(-5-3i\right)$  

•  $-22+14i$  

•  $-22-14i$  

•  $22+14i$  

•  $22-14i$  

Simplify the expression

 $\left(1+7i\right)\left(9+3i\right)-\left(4+2i\right)$  

•  $16+64i$  

•  $-16-64i$  

•  $-16+64i$  

•  $16-64i$  

What does i² = ?

• -1
• √-1
• 1
• -√1

Tags

CCSS.HSN.CN.A.1

What letter usually represent imaginary number?

• a
• i
• j
• x

Tags

CCSS.HSN.CN.A.1

Find the conjugate of:
5 + 7i

• 5 − 7i
• -5 − 7i
• -5 + 7i

Tags

CCSS.8.EE.A.2

I find the content/material on Complex Number Operations...

• 1-Difficult.

• 5-Challenging but I understand.

• 10-Easy to understand.

I watched the video for today's class... (be honest)

• yes

• no

• part of it