All categories

3 years ago

X2 + 9x + 2 = 0 has how many real solutions

Mathematics

2 answers:

Nonamiya [84]3 years ago

6 0

Answer:

1. it is x=-2/11

Step-by-step explanation:

mestny [16]3 years ago

6 0

Answer:

Step-by-step explanation:

hello :

x² + 9x + 2 = 0

∆ =b²- 4ac when : a =1 and b=9 and c=2

∆ =b²- 4ac = (9)²-4(1)(2) =81-8 = 73

∆ >0 two reals solutions......

You might be interested in

Write the equation of the line that has a slope of 5 and a y-intercept of 9.

Anon25 [30]

Answer:

Realmente no lo se.

Step-by-step explanation:

Realmente no lo se. no sé. así que sí, lo siento, no puedo ayudar.

7 0

3 years ago

A school needs 5,000 to buy new books for the library. So far the school has raised 75%

ohaa [14]

Answer:

Results are below.

Step-by-step explanation:

Giving the following information:

Total money needed= $5,000

Percentage raised= 75%

<u>To calculate the amount collected and the difference required, we need to use the following formulas:</u>

Total collected= 5,000*0.75

Total collected= $3,750

Difference= 5,000 - 3,750

Difference= $1,250

4 0

3 years ago

I dont know how to do this. I know the answer is -3 but I dont know how I dont understand

monitta

Answer:

Step-by-step explanation:

PEMDAS

parenthesis

, exponents,

multiplication,

division,

addition,

subtraction.

6 0

3 years ago

The length of the diagonal of a wooden cube is 24 cm. The cube is cut into the cylinder of the

jek_recluse [69]

The biggest possible volume of the cylinder will be $2089.497\hspace{1mm}\text{cm}^3$ .

<h3>What will be the diameter and height of the cylinder obtained from a cube and what are the formulas for the diagonal of a cube and the volume of a cylinder?</h3>

If a cylinder with the biggest possible volume is cut inside the cube, the height of the cylinder and the diameter of the cylinder will be equal to the side length of the cube.
For example, consider the following figure in which the cylinder is cut inside of the cube and since the side length of the cube is $x$ , the diameter and the height of the cylinder are also $x$
If the side length of a cube is $x$ unit, then its diagonal will be $x\sqrt{3}$ unit.
The formula for the volume of a cylinder is $V=\pi r^2h$ , where $r$ is the radius and $h$ is the height of the cylinder. If $d$ is the diameter, then $r=\frac{d}{2}$ .

Now, given that the diagonal of the cube is $24$ cm. So, if the side length of the cube is $x$ cm, then we must have

$x\sqrt{3}=24\\\Longrightarrow x=\frac{24}{\sqrt{3}}\\\Longrightarrow x=8\sqrt{3}$

Thus, the side length of the cube is $8\sqrt{3}$ cm.

So, the height of the cylinder with maximum volume will be $h=8\sqrt{3}$ cm and the diameter will be $d=8\sqrt{3}$ cm i.e. the radius will be $r=\frac{d}{2}=\frac{8\sqrt{3}}{2}=4\sqrt{3}$ cm.