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
andrezito [222]
3 years ago
15

Which of the following is a solution to 2cos2x − cos x − 1 = 0?\

Mathematics
1 answer:
goblinko [34]3 years ago
5 0

Answer:

Option A is correct.

Solution for the given equation is,

Step-by-step explanation:

Given that : Let then our equation become; .....[1]

A quadratic equation is of the form:

.....[2] where a, b and c are coefficient and the solution is given by;

Comparing equation [1] and [2] we get;

a = 2 b = -1 and c =-1

then;Simplify:or and

Simplify:y = 1 and

Substitute y = cos x we have;⇒and⇒

The solution set:  

Therefore, the solution for the given equation   is, 0 degrees

You might be interested in
The length of a rectangle is five times its width.
kykrilka [37]

Answer:

w=10

L=50

Step-by-step explanation:

<h2><em>Length=5w</em></h2><h2><em>Width=W</em></h2>

6w=60

----   ----

6       6

w=10

5(10)=50

L=50

Also can you make me the top answer?

4 0
3 years ago
James decides to walk from school to the park to play ball. The park is only 0.5 mile from the school. He leaves school at 3:15
miskamm [114]

Answer: C

Step-by-step explanation: We see that it took James 10 minutes to go 0.5 miles, so to get how many miles an hour James is traveling, we need to get the miles to 1. To do this, multiply by 2, and this will give you that it took James 20 minutes to go 1 mile. This is option C.

7 0
3 years ago
Lara went to the nursery and spent $140 she purchased 4 plants each of the plant costs the same price what is the cost of 1 plan
trapecia [35]

Answer:

$35 per plant

Step-by-step explanation:

You take the 140 and divide that by 4 to get your answer.

8 0
2 years ago
The explicit formula for the nth term of an arithmetic sequence is an = a1 + (n - 1) • d. What is the simple formula correspondi
BlackZzzverrR [31]
= -10 + (n - 1)*4
= -10 + 4n - 4
= 4n - 14
5 0
3 years ago
Help me please i put 15 points i think that means it gives you 7 or 8 points??
castortr0y [4]

Answer:

Mean: 0.15125

Median: 0.05

Mode: .05

Range: 0.495

Hope this helps!

3 0
3 years ago
Other questions:
  • I need help for #2 please
    7·1 answer
  • How much glass is needed to manufacture 1000 paperweights
    7·1 answer
  • The equation of line EF is y = 2x + 1. Write an equation of a line parallel to line EF in slope-intercept form that contains poi
    10·2 answers
  • What’s the slope of the line?
    15·1 answer
  • Question 1 (10 points)
    5·1 answer
  • Sara is considering charging her electric car. If she goes to the charging station on the following map, she will have to drive
    14·2 answers
  • Write an equation you could use for this word problem. Do not need to solve.
    11·2 answers
  • Help pls area of compound figures
    11·1 answer
  • Initial value problems dy/dx+2y=3. Y(0)=1
    10·1 answer
  • Solve this system of equations by using the elimination method.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!