All categories

2 years ago

What is/are the exact solutions for the equation 2cos^2x+3cosx+1=0 on the intercal (0,2pi)

Mathematics

1 answer:

Dafna1 [17]2 years ago

5 0

Answer:

x = $\frac{2\pi }{3}$ and $\frac{4\pi }{3}$

Step-by-step explanation:

I graphed the equation below.

If these answers are correct, please make me Brainliest!

You might be interested in

Please help me out! :)

Goryan [66]

Answer:

$\frac{1}{6}$

Step-by-step explanation:

the third option

3 0

3 years ago

Read 2 more answers

Otse verharan's office maskiner weighed 550 grams on the second visit the kinen had gained 350 grams. On the two visit the

pantera1 [17]

Answer:

63.64%

Step-by-step explanation:

4 0

2 years ago

2. The path of a high diver is given by y = + (2x2 – 9x – 56), where y is the height of the diver

timofeeve [1]

Answer:

The diver will be 8 feet from the end of the board when he hits the water.

Step-by-step explanation:

The diver hits the water when y = 0.

To find the distance, we have to find the values of x when y = 0.

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

$ax^{2} + bx + c, a\neq0$ .

This polynomial has roots $x_{1}, x_{2}$ such that $ax^{2} + bx + c = (x - x_{1})*(x - x_{2})$ , given by the following formulas:

$x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}$

$x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}$

$\bigtriangleup = b^{2} - 4ac$

In this problem, we have that:

$y = 2x^{2} - 9x - 56$

$2x^{2} - 9x - 56 = 0$

$a = 2, b = -9, c = -56$

Then

$\bigtriangleup = b^{2} - 4ac = (-9)^{2} - 4*2(-56) = 529$

$x_{1} = \frac{-(-9) + \sqrt{529}}{2*2} = 8$

$x_{2} = \frac{-(-9) - \sqrt{529}}{2*2} = -3.5$

It is a horizontal distance, so the answer is a positive value.

The diver will be 8 feet from the end of the board when he hits the water.

7 0

3 years ago

The moon is about 240,000 miles from earth earth what is the distance written as a whole number multiplied by a power of ten

Varvara68 [4.7K]

<span>This would be 24 X 10⁴</span>

7 0

3 years ago

Help please which statement best completes the diagram?

avanturin [10]

Answer:

Step-by-step explanation:

This is by definition of civil law

3 0

1 year ago