Lesson Example Discussion Quiz: Class Homework |
Step-2 |
Title: Division of complex numbers |
Grade: 8-b Lesson: S2-L7 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
Step | Type | Explanation | Answer |
---|---|---|---|
1 |
Problem |
Divide \$( - 6 + 8i)/ (- 3 + 4i)\$. |
|
2 |
Step |
The given |
\$( - 6 + 8i)/ (- 3 + 4i)\$ |
3 |
Hint |
Find the conjugate of the denominator: |
Conjugate of (- 3 + 4i) = - 3 - 4i |
4 |
Step |
Multiply the numerator and the denominator by the conjugate of the denominator: |
\$(- 6 + 8i)/(- 3 + 4i) times ((- 3 - 4i)/(- 3- 4i))\$ |
5 |
Hint |
Since \$i^2 = - 1\$. |
|
6 |
Step |
Calculate the denominator and plug the \$i^2 = -1\$ and then simplify it: |
\$ (- 3 + 4i)(- 3 - 4i) = (- 3)^2 - (4i)^2 \$ \$ (a - b) ( a + b) = a^2 - b^2 \$ \$ 9 - 16i^2 = 9 - 16(-1) = 9 + 16 = 25\$ |
7 |
Step |
Calculate the numerator and plug the \$i^2 = -1\$ and then make it simplify: |
\$(- 6 + 8i)(- 3 - 4i) \$ ⇒ \$ - 6 times (- 3)+(- 6) times (- 4i) + 8i times (-3) + 8i times (- 4i)\$ ⇒ \$ 18 + 24i - 24i - 32i^2\$ ⇒ 18 - 32(-1) ⇒ 18 + 32 ⇒ 50 |
8 |
Step |
Combine the results: |
\$( - 6 + 8i)/ (- 3 + 4i) = \cancel(50)^2 / \cancel(25)\$ ⇒ 2 |
9 |
Step |
Therefore, the division of complex numbers is 2. |
|
10 |
Choice.A |
Wrong: Because it does not match the result of dividing the two complex numbers. The correct result of the division is indeed 2, not 25 |
25 |
11 |
Choice.B |
Option B is incorrect because it suggests the result is 5. This does not match the correct calculation |
5 |
12 |
Choice.C |
The complex numbers are accurately divided, confirming the result is correct |
2 |
13 |
Choice.D |
Option D represents the numerator of the fraction, not the final result after the division |
50 |
14 |
Answer |
Option |
C |
15 |
Sumup |
Can you summarize what you’ve understood in the above steps? |
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