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lord [1]
3 years ago
8

6х + Зу = 12 Slope-intercept

Mathematics
1 answer:
bagirrra123 [75]3 years ago
4 0

Answer:

x=2,y=4

Step-by-step explanation:

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Solve the given initial-value problem. x^2y'' + xy' + y = 0, y(1) = 1, y'(1) = 8
Kitty [74]
Substitute z=\ln x, so that

\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{\mathrm dy}{\mathrm dz}\cdot\dfrac{\mathrm dz}{\mathrm dx}=\dfrac1x\dfrac{\mathrm dy}{\mathrm dz}

\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\mathrm d}{\mathrm dx}\left[\dfrac1x\dfrac{\mathrm dy}{\mathrm dz}\right]=-\dfrac1{x^2}\dfrac{\mathrm dy}{\mathrm dz}+\dfrac1x\left(\dfrac1x\dfrac{\mathrm d^2y}{\mathrm dz^2}\right)=\dfrac1{x^2}\left(\dfrac{\mathrm d^2y}{\mathrm dz^2}-\dfrac{\mathrm dy}{\mathrm dz}\right)

Then the ODE becomes


x^2\dfrac{\mathrm d^2y}{\mathrm dx^2}+x\dfrac{\mathrm dy}{\mathrm dx}+y=0\implies\left(\dfrac{\mathrm d^2y}{\mathrm dz^2}-\dfrac{\mathrm dy}{\mathrm dz}\right)+\dfrac{\mathrm dy}{\mathrm dz}+y=0
\implies\dfrac{\mathrm d^2y}{\mathrm dz^2}+y=0

which has the characteristic equation r^2+1=0 with roots at r=\pm i. This means the characteristic solution for y(z) is

y_C(z)=C_1\cos z+C_2\sin z

and in terms of y(x), this is

y_C(x)=C_1\cos(\ln x)+C_2\sin(\ln x)

From the given initial conditions, we find

y(1)=1\implies 1=C_1\cos0+C_2\sin0\implies C_1=1
y'(1)=8\implies 8=-C_1\dfrac{\sin0}1+C_2\dfrac{\cos0}1\implies C_2=8

so the particular solution to the IVP is

y(x)=\cos(\ln x)+8\sin(\ln x)
4 0
3 years ago
F(x)=2x^2+4x+5<br> Find : f(a)=
VladimirAG [237]

Answer:

f(a) = 2a^2 + 4a + 5

Step-by-step explanation:

You just need to replace the "x" with the "a".

7 0
3 years ago
Which statement describes the system of equations?
Masja [62]

Answer:

1.) It has one solution (–5, 5).

if you click on the photo it will show you how to get the answer. I hope this helps you.

7 0
2 years ago
Please help me with this
marin [14]

Answer:

B. 5(7 + 65 - 9t)

And

C. ) (-35-30s+45t)× (-1)

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
36 boys complete a school task in 4 hours. How many boys would be required to complete the same task in 2¼ hours?​
vova2212 [387]

Answer:

20

Step-by-step explanation:

If 36 boys can conplete a task in 4 hours, then 19.35 boys could do it in 2 and a fourth hours.

You can set up an equation

A fourth of an hour is 15 minutes, so,

36 is to 4 as x is to 2.15, or,

36=4 as X=2.15

Multiply 2.15 by 36 (77.4)

77.4 divided by 4= 19.35.

Of course, you cannot have 19.35 boys, so there must be 20.

Hope this helps!

8 0
3 years ago
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