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Nady [450]
3 years ago
15

Plzz help for brainly

Mathematics
1 answer:
PolarNik [594]3 years ago
8 0

Answer:first one

Step-by-step explanation:

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y=c1e^x+c2e^−x is a two-parameter family of solutions of the second order differential equation y′′−y=0. Find a solution of the
vagabundo [1.1K]

The general form of a solution of the differential equation is already provided for us:

y(x) = c_1 \textrm{e}^x + c_2\textrm{e}^{-x},

where c_1, c_2 \in \mathbb{R}. We now want to find a solution y such that y(-1)=3 and y'(-1)=-3. Therefore, all we need to do is find the constants c_1 and c_2 that satisfy the initial conditions. For the first condition, we have:y(-1)=3 \iff c_1 \textrm{e}^{-1} + c_2 \textrm{e}^{-(-1)} = 3 \iff c_1\textrm{e}^{-1} + c_2\textrm{e} = 3.

For the second condition, we need to find the derivative y' first. In this case, we have:

y'(x) = \left(c_1\textrm{e}^x + c_2\textrm{e}^{-x}\right)' = c_1\textrm{e}^x - c_2\textrm{e}^{-x}.

Therefore:

y'(-1) = -3 \iff c_1\textrm{e}^{-1} - c_2\textrm{e}^{-(-1)} = -3 \iff c_1\textrm{e}^{-1} - c_2\textrm{e} = -3.

This means that we must solve the following system of equations:

\begin{cases}c_1\textrm{e}^{-1} + c_2\textrm{e} = 3 \\ c_1\textrm{e}^{-1} - c_2\textrm{e} = -3\end{cases}.

If we add the equations above, we get:

\left(c_1\textrm{e}^{-1} + c_2\textrm{e}\right) + \left(c_1\textrm{e}^{-1} - c_2\textrm{e}  \right) = 3-3 \iff 2c_1\textrm{e}^{-1} = 0 \iff c_1 = 0.

If we now substitute c_1 = 0 into either of the equations in the system, we get:

c_2 \textrm{e} = 3 \iff c_2 = \dfrac{3}{\textrm{e}} = 3\textrm{e}^{-1.}

This means that the solution obeying the initial conditions is:

\boxed{y(x) = 3\textrm{e}^{-1} \times \textrm{e}^{-x} = 3\textrm{e}^{-x-1}}.

Indeed, we can see that:

y(-1) = 3\textrm{e}^{-(-1) -1} = 3\textrm{e}^{1-1} = 3\textrm{e}^0 = 3

y'(x) =-3\textrm{e}^{-x-1} \implies y'(-1) = -3\textrm{e}^{-(-1)-1} = -3\textrm{e}^{1-1} = -3\textrm{e}^0 = -3,

which do correspond to the desired initial conditions.

3 0
3 years ago
What is the location of point R on the number line?<br> 14/5, 16/5, 18/5, 22/5
SOVA2 [1]

Answer: 14/5

Step-by-step explanation:

5 0
3 years ago
I’m thinking of two numbers. Their greatest common factor is 6. Their least common multiple is 36. One of the numbers is 12. Wha
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The number of all divisors of 6 <span> 
6 multiples of the number 18 we find one of
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3 years ago
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Assignment: Organizing the Build Investigation
pentagon [3]

The first step to solving this problem is to decide the best approach to organizing the Nuts and Screws.

I personally would start by separating both groups, this way it becomes easier to know roughly where to look to find what you need. After doing this it would make sense to simply place the bigger Nuts with the bigger Nuts and the bigger screws with the bigger screws, which would leave you with 4 separate groups. The 2 nut groups would be on one side and the 2 screw groups would be on the side.

Now for the number line, I have included the decimal numbers in order down below, we will start with the smallest fraction and begin to plot the points.

*I have also included my graph that I drew on Desmos as well down below*

And now by using everything I have given you the answer to the last question becomes clear ;-) :

4 Screws 1/16” x 3” long

6 Screws 11/64” x 4” long

16 Screws 3/8” x 2” long

1 Screw 7/16” x 3” long

12 Screws 5/64” x 3” long

3 Screws 3/32” x 4” long

1 Screw 1/2” x 3” long

1 Screw 3/4” x 2” long

4 Hex bolts 1.5” x 4” long

DSMT4 4 Hex bolts 1 7/8” x 4” long

1 Hex bolt 2.25” x 2” long

4 Hex bolts 3.75” x 3” long

6 Hex bolts 3 3/8” x 3” long

If you find out that my answer is wrong just let me know, and I guarantee that I will come back and rework my math :-)

Ps. By rating people and giving people Brainliest you not only make them feel good but you get 25% of the points you spent back :-)

6 0
3 years ago
What does the 5m represent in the problem above?
Elan Coil [88]
It’s should be Radius
4 0
3 years ago
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