Step-5

Title: Trigonometry equations

Grade: 10-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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