Sec. 2.4: Complex Numbers and Operations (Day 1 Review / Day 2 Lesson) - 1st Period Alg 2

Sec. 2.4: Complex Numbers and Operations (Day 1 Review / Day 2 Lesson) - Alg 2

​Day 1 Review:

​Complete the problems on the following slides to review the material from Day 1 of Section 2.4.

​

**If you were absent Monday, please view the video below first to catch up on material and fill in your notes. Then complete the following slides.

Multiple Choice

$$\sqrt{-9}$$  

• 3

• -3

• $$9i$$  

• $$3i$$  

Multiple Choice

Simplify 

$$\sqrt{-23}$$  

• $$-\sqrt{23}$$  

• $$23i$$  

• 23

• $$i\sqrt{23}$$  

Multiple Choice

$$\sqrt{-20}$$  

• $$2i\sqrt{5}$$  

• $$-2i\sqrt{5}$$  

• $$20i$$  

• $$-20i$$  

Multiple Choice

What is the value of i²?

• -1

• 1

• i

• -i

Multiple Choice

Solve.   x² = -90

• $$x=3\ \sqrt[]{10}$$  

• $$x=\pm9\ \sqrt[]{10}$$  

• $$x=\pm3\ \sqrt[]{10}$$  

• $$x=\pm3i\ \sqrt[]{10}$$  

Multiple Choice

Solve:   x² + 12 = 5

• x = ± 49
• $$x=\pm i\ \sqrt[]{7}$$  

• $$x=\pm\sqrt[]{7}$$  

• x = ± 3.5i

Multiple Choice

Solve:   3x² = -12

• ± 2
• $$\pm2i\ \sqrt[]{3}$$  

• $$\pm i\ \sqrt[]{12}$$  

•   $$\pm2i$$  

​Sec. 2.4 - Day 2 Lesson:

​Please view the video lesson for Day 2 of Section 2.4 and fill in your notes in along with the video..

​Oops!

​I accidentally hit "stop" when recording the last example. Please see below for the final work for the last part of p. 12.

​Practice Time!!

​Please complete the problems on the following slides to practice the material from today's lesson.

Multiple Choice

Simplify:  (4 + 7i) + (8 - 2i)

• 34i

• 28 + 6i

• 12 + 5i

• -4 + 9i

Multiple Choice

Simplify: (3 - 2i) - (4 - 2i)

• -1

• 7 - 4i

• 1 - 2i

• -i

Multiple Choice

Simplify:  (5 + 8i) + (6 - 10i)

• -1 - 18i

• 11 - 2i

• 13 - 4i

• -20i

Multiple Choice

Simplify:  (-9 - 5i) - (2 - 7i)

• -40 + 14i

• -7 - 12i

• -59i

• -11 + 2i

Multiple Choice

Simplify: (3 - 4i)(2 + i)

• -12+2i

• -24i

• 10-5i

Multiple Choice

Simplify:  (5 - 3i)(2 - 5i)

• 25-31i

• -5-31i

• -15-10i

• -25i

Multiple Choice

Simplify: (10 + 3i) - (2 - 9i)

• 20 - 27i

• 12 - 7i

• 8 + 12i

• 20 - 27i²

Multiple Choice

Simplify:  3i(-2 + 4i)

• -6 + 12i

• -12 - 6i

• -2 + 7i

• 12 + 6i

​THE END!

​Thank you for completing today's lesson. Please make note of any questions you have so we can answer them tomorrow. Have a great day!