We have our final exam today. I will send the exam result to you individually via email, and also post answers.
Math 9, Lesson 16, 1/26/2023
Weidong Posted in Fall 2022, Math 9, Teaching info，
26
January
2023
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Math 9, Lesson 15, 1/19/2023
Weidong Posted in Fall 2022, Math 9, Teaching info，
19
January
2023
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We have a review today. We will have our final exam for the Fall Semester next Sunday.
Answers to Lesson 14 Homework
Weidong Posted in Teaching info，
19
January
2023
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3.3.1 26 * 10 = 260
3.3.2 z = a + bi, |z| = sqrt(a^2 + b^2) = sqrt (a^2 + (-b)^2) = |z bar|
3.3.3 z = 12/7 + 5i
3.3.4 (a) z = 1 + i, z = -1 – i (b) z = 2 + 3i, z = -2 -3i (c) z 5 – i. z = -5 + i
3.3.5 (a) 1/5 (b) 1/5 (c) 5/13 (d) 5/13
3.3.6 (a) All non-zero imaginary numbers or all non-zero real numbers (b) all complex numbers satisfying z = a + ai or z = a – ai
3.3.7 x = +/- 3i
Math 9, Lesson 14, 1/12/2023
Weidong Posted in Fall 2022, Homework, Math 9, Teaching info，
12
January
2023
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We continue our study of complex number. Today we look at various properties of a complex number with its conjugate.
Homework (pages are links. Click to download): Page 3,
3,3.1 – 3.3.1 – 3.3.7
