Just for clarification below is the question again (d^2 y)/(dx^2 )+4dy/dx+3y=0 subject to initial condition where dy/dx=4 and y=4. Can you help me explain how this can be solved?

Just for clarification below is the question again

(d^2 y)/(dx^2 )+4dy/dx+3y=0 subject to initial condition where dy/dx=4 and y=4.

Can you help me explain how this can be solved?

[KSSV]

doc ode45

[Joshua Amuga]

dsolve('D2y-4*Dy+3*y','y(0)=3','Dy(0)=4')

[Walter Roberson]

Joshua Amuga comments to KSSV:

IVP :=ode({y''(x)+4*y'(x)+3*y,y(0)=3,y'(0)=4},y(x));

 Undefined function or variable 'IVP'.

[Walter Roberson]

Joshua Amuga: you have attempted to use MuPAD syntax in MATLAB. You need to command

nb

and then use the command in the MuPAD notebook that opens.

Answer 1

[Walter Roberson]

dsolve() or one of the ode* routines.

[Joshua Amuga]

ode({y''(x)+4*y'(x)+3*y,y(0)=3,y'(0)=4},y(x));

i keep getting an error. Can you help me write the code

[Walter Roberson]

You are attempting to use MuPAD syntax in MATLAB. The solution you posted of

dsolve('D2y-4*Dy+3*y','y(0)=3','Dy(0)=4')

appears to me to be valid.