Working with Complex Numbers

Which of the following is equivalent to

 $\sqrt{-9}$  ?

•  $-3$  

•  $3$  

•  $9i$  

•  $3i$  

What is

 $\sqrt{-100}$  written as an imaginary number?

Choose the two options below that are imaginary.

• $14i$

• -16

• $\sqrt{-13}$

• $\sqrt{21}$

Tags

CCSS.HSN.CN.A.1

Simplify

 $-2\sqrt{-16}$ 

•  $-8i$  

•  $-32i$  

•  $-8$  

•  $8$  

Tags

CCSS.HSN.CN.A.1

Complete the sentence: Quadratics will have 2 complex solutions if the discriminant is _____________.

Tags

CCSS.HSA-REI.B.4B

Select all of the following that are possible solutions for a quadratic equation. There are 3 correct responses.

• 2 real solutions, 0 complex solutions

• 1 real solution, 0 complex solutions

• 1 real solution, 1 complex solution

• 0 real solutions, 1 complex solution

• 0 real solutions, 2 complex solutions

Tags

CCSS.HSN.CN.A.1

What are the solutions to the graph above?

• 2 real, 0 complex

• 1 real, 0 complex

• 0 real, 2 complex

What is the discriminant of

 $y=2x^2+5x+4$ ? 

Tags

CCSS.HSA-REI.B.4B

What is

 $i^2$  equal to?

Tags

CCSS.HSN.CN.A.1

Simplify: 
(7 + 2i)(9 - 6i)

• 75-24i
• 63 - 24i  - 12i²
• 51 - 24i
• 58 + 60i

Tags

CCSS.HSN.CN.A.2