+0  
 
0
967
10
avatar+466 

2 tan 4x - 1/2 = -1/2


I know that I am solving x, x being different angles. But I don't know how to get into this position:


tan 4x = (number)


Please help, I need an official of this site to help, not a guest. I need an angle sequence to fill in for x as the answer.

 Dec 15, 2015

Best Answer 

 #6
avatar+129852 
+15

LambLamb has given the correct answer.....note......

 

tan x  =  0   at

 

0, 180, 360, 540, 720, 900, 1080, 1260, 1440

 

So......dividing each angle by 4, we have

 

0, 45, 90, 135 , 180, 225, 270, 315 , 360

 

 

So.....the general solution is    0 + n45°   or   0 + n(pi/4)  in radians

 

 

cool cool cool

 Dec 16, 2015
 #1
avatar+495 
+5

I'll see what I can do.

 

2 tan 4x -1/2 = -1/2

(+1/2 to both sides)

2 tan 4x =0

(both sides divided by 2)

tan4x = 0/2 = 0

(inverse tan of both sides)

4x = 0

(divide both sides by 4)

x = 0/4 = 0

 

0 is your answer.

 

A general answer would be \(0+\frac{nπ}{2}\)

 

Shades, I really, truly, hope you found this helpful. I'm sorry it took 2+ hours to get to this question, and I hope you haven't given up.

 Dec 15, 2015
 #2
avatar+495 
+5

Here's one instance of an angle sequence:

 

-2π, -3π/2, -π, -π/2, 0, π/2, π, 3π/2, 2π

 Dec 15, 2015
 #3
avatar+466 
0

Alright, the only thing is, I am generally supposed to have an angle for an answer, such as 15o, 10o, etc. Usually there is a sequence of angles that will work for the equation as well.

 Dec 15, 2015
 #4
avatar+466 
0

Here is an example of what I usually deal with:

sin 3x = 1/2

The answer to this being 100, 1300, 2500, 1500, 1700, 2900 All of the angles that can be multiplied by 3 and then the sin will equal 1/2, or .5.

 Dec 15, 2015
 #5
avatar+495 
+5

0° and multiples of 180°

 

Like this: 0°, 180°, 360°, 540°, 720°, etc.

 

edit: multiples of 45° also work.

 Dec 16, 2015
edited by LambLamb  Dec 16, 2015
 #6
avatar+129852 
+15
Best Answer

LambLamb has given the correct answer.....note......

 

tan x  =  0   at

 

0, 180, 360, 540, 720, 900, 1080, 1260, 1440

 

So......dividing each angle by 4, we have

 

0, 45, 90, 135 , 180, 225, 270, 315 , 360

 

 

So.....the general solution is    0 + n45°   or   0 + n(pi/4)  in radians

 

 

cool cool cool

CPhill Dec 16, 2015
 #7
avatar
0

Talk about the blind leading the blind !

Melody or some other moderator, please intervene.

 Dec 16, 2015
 #8
avatar+466 
0

Thank you everyone very much, this has helped me very much! cool

 Dec 16, 2015
 #9
avatar+129852 
+10

Uh.....Guest.....I might be blind, but  I'm not stupid........here's a graph of the solutions.....I think you will find that it matches  my answer........

 

https://www.desmos.com/calculator/idt39vmsqs

 

 

 

cool cool cool

 Dec 16, 2015
 #10
avatar
0

The comment referred to responses #1 to #5.

#6 was posted just seconds before #7.

 Dec 16, 2015

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