1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
asambeis [7]
3 years ago
6

Solve the equation 2 cos x + 1 = 0 , 0 <= x <= 2pi PLEASE HELP! WILL AWARD!

Mathematics
2 answers:
Keith_Richards [23]3 years ago
6 0
It would be pi over 6, 5 pi over 6, and 3 pi over 6.
OleMash [197]3 years ago
3 0
Im not saying its right but I got <span>0,<span><span>2π</span>3</span>,<span><span>4π</span>3</span>,and2π  </span><span><span>f<span>(x)</span></span>=2<span><span>cos2</span>x</span>−<span>cosx</span>−1=0</span>
Solve this quadratic equation for cos x.
Since a + b + c = 0, use shortcut.
One real root is cos x = 1 and the other is <span><span>cosx</span>=<span>ca</span>=−<span>12</span></span>.
Trig table and unit circle -->
a. cos x = 1 --> arc x = 0, and arc <span>x=2π</span>
b. <span><span>cosx</span>=−<span>12</span></span> --> arc <span>x=±<span><span>2π</span>3</span></span>
The arc <span><span>−2π</span>3</span> is co-terminal to the arc: <span><span>4π</span>3</span>
Answers for <span><span>(0,2π)</span>:</span>
<span>0,<span><span>2π</span>3</span>,<span><span>4π</span>3</span>,and2<span>π</span></span>
You might be interested in
A scientist has two solutions, which she has labeled Solution A and Solution B. Each contains salt. She knows that Solution A is
Scorpion4ik [409]

Answer:

  • 26 ounces of 55% solution
  • 104 ounces of 80% solution

Step-by-step explanation:

Let x represent the quantity of 80% solution. Then 130-x is the amount of 55% solution. The total amount of salt in the mix is ...

  0.80x +0.55(130 -x) = 0.75·130

  0.25x = 0.20·130 . . . . . . . subtract 0.55(130)

  x = 0.20/0.25(130) = 104

  130-x = 26

She should use 26 ounces of 55% solution and 104 ounces of 80% solution.

5 0
3 years ago
Solve.<br> 9x + 6y = -3<br> y = -8
klio [65]

Answer:

5

Step-by-step explanation:

9x+6y=-3

9x+6(-8)=-3

9x-48=-3

9x=45

x=5

6 0
2 years ago
Read 2 more answers
What is the smallest of three consecutive positive integers if the product of the smaller two integers is 10 more than 4 times t
r-ruslan [8.4K]
The smallest is 6
Three consecutive integers
X. Smallest 6
X+1. 7
X+2. Largest 8

X(X+1)= 4(X+2)+10
X^2+X= 4x+8+10
X^2+X-4x-18=0
X^2-3x-18=0

( X+3)(X-6)
X=-3. X=6
Don't use the negative

Check 6(7)= 4(8)+10
42=42
8 0
3 years ago
Y: 2x+3+9x+2<br> Simplify this
BARSIC [14]

Answer:

y=16x ??

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
N+4+10=25 pleas solve for me that will make me happy
masha68 [24]

N=11 because 4+10= 14 and 25-14 = 11

8 0
3 years ago
Read 2 more answers
Other questions:
  • Line segment ST is congruent to which line segment?<br> SK<br> KU<br> UT<br> TK
    15·2 answers
  • Plsss helppp meee thankssss
    10·1 answer
  • Diameter of wheel of car is 35 cm . how much distance will it cover in 1000 revolution.
    7·1 answer
  • What addition doubles fact can help you find 4 + 3 explain how you know
    13·2 answers
  • Indicate in standard form the equation of the line passing through the given points, writing the answer in the equation
    5·1 answer
  • 87789-8977609-78860=
    12·2 answers
  • What coins do I have?
    8·2 answers
  • A ballet company has sold 540 tickets for the next performance. Tickets for the center section are $56 while tickets for the lef
    15·1 answer
  • (PLSS HELP FAST!!) Which parallelograms below have the same area?
    13·2 answers
  • A model satellite has a scale of 1 cm : 3 m. If the real satellite is 18 m wide, then how wide is the model satellite?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!