Lesson Example Discussion Quiz: Class Homework |
Step-5 |
Title: Trigonometry equations |
Grade: 1400-a Lesson: S3-L5 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
Step | Type | Explanation | Answer |
---|---|---|---|
1 |
Problem |
Identify the general solution to the equation: 3(tan(2x) - 4) + 9 = 0. |
|
2 |
Step |
The given equation is |
3(tan(2x) - 4) + 9 = 0 |
3 |
Step |
First, distribute the 3 and combine the like terms: |
3tan(2x) − 12 + 9 = 0 3tan(2x) − 3 = 0 |
4 |
Step |
Add 3 to both sides and divide both sides by 3 |
3tan(2x) = 3 tan(2x) = 1 |
5 |
Step |
To solve for 2x, take the arctangent (inverse tangent) of both sides: |
2x = arctan(1) |
6 |
Step |
Since \$ arctan(1) = pi/4 + npi \$ where n is any integer, we have: |
\$ 2x = pi/4 + npi \$ |
7 |
Step |
Finally, solve for x by dividing both sides by 2 |
\$ x = pi/8 + (npi)/2 \$ |
8 |
Step |
So, the general solution for x is \$ x = pi/8 + (npi)/2 \$, where n is any integer. |
|
9 |
Choice.A |
It represents a solution where x can take on any value equal to π plus an integer multiple of π. This doesn’t match the general solution we derived, so option A is incorrect |
\$ x = pi + npi\$ |
10 |
Choice.B |
This option suggests that x equals \$pi/2\$ plus an integer multiple of \$(3pi)/2\$. it doesn’t match the general solution we derived, so option B is incorrect |
\$ x = pi/2 + (3npi)/2\$ |
11 |
Choice.C |
This option matches the general solution we derived: x = \$ pi/8 + (npi)/2\$, where n is an integer. It correctly represents the general solution to the equation, so option C is correct |
\$ x = pi/8 + (npi)/2\$ |
12 |
Choice.D |
This option suggests that x equals \$pi/3\$ plus an integer multiple of \$pi/3\$. It doesn’t match the general solution we derived, so option D is incorrect |
\$ x = pi/3 + (npi)/3\$ |
13 |
Answer |
Option |
C |
14 |
Sumup |
Can you summarize what you’ve understood in the above steps? |
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