All categories

2 years ago

What value(s) of x will make x²=81 true?

Mathematics

2 answers:

Yanka [14]2 years ago

5 0

Answer: 9

Step-by-step explanation:

9x9=81

gladu [14]2 years ago

4 0

Answer: 9,-9

Step-by-step explanation:

You might be interested in

Fh+2g=t. solve for g

Ierofanga [76]

Step-by-step explanation:

2g = t -fh

$g = \frac{t - fh}{2}$

8 0

3 years ago

Please show me how to do this problem

sleet_krkn [62]

Answer:

Hi there, you can use Pitagoras relationship to solve this up (Without using any other "tool".

Point A is located wheter in (-6,8) or could be located in (-6,8)

Step-by-step explanation:

Point A is 10 units away from the origin, and its x coordinate is -6, using this information, you can draw a triangle from 0 to -6 (the basis) and using 10 as the hypotenuse, so, you have this equation:

$H^{2} = x^{2} +y^{2}$

solving for Y variable, you have this

y=± $\sqrt{10^{2}-(-6)^{2} }$

Note the combined sing ±, meaning that y=8 is a valid answer and that y= -8 is also a valid answer.

Hope It helps

5 0

3 years ago

Explain how to use a graph of the function f(x) to<br> find f(3).

creativ13 [48]

Answer:

See below.

Step-by-step explanation:

f(3) means the y-coordinate of the point that has x-coordinate 3.

To find f(3) using a graph of f(x).

Look up x = 3 on the x axis. If the function passes through that point on the x-axis, then f(3) is 0. If the function does not pass through that point, then go up or down till you intersect the function. Draw a horizontal segment left to the y-axis and read the point on the y-axis that the horizontal segment intersects. That is what f(3) is equal to.

6 0

4 years ago

Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the curves about the given

rewona [7]

Answer:

5.81

Step-by-step explanation:

The method of cylindrical shells uses this formula:

$\int\limits^a_b {2 \pi * shellRadius * shellHeight} \, dx$

It integrates the pieces of area in the region.

In this case:

$2 \pi * \int\limits^2_0 {x * cos(\frac{\pi}{4} * x)} \, dx$

Integrating by computer:

$2*\pi*(\frac{4}{\pi^2}*(\pi*x*sin(\frac{\pi}{4}*x) + 4*cos(\frac{\pi}{4}*x)))$

Evaluating between 0 and 2

$2\pi * (\frac{4}{\pi^2}*(\pi*2*sin(\frac{\pi}{4}*2) + 4*cos(\frac{\pi}{4}*2)) - \frac{4}{\pi^2}*(\pi*0*sin(\frac{\pi}{4}*0) + 4*cos(\frac{\pi}{4}*0))) = 5.81$