1) Read this: Linear Homogeneous Ordinary Differential Equations with Constant Coefficients
2) Perhaps try the model and solve for a and b. Is the function in 3) meant to be the same as the function in 2)?
1) Read this: Linear Homogeneous Ordinary Differential Equations with Constant Coefficients
2) Perhaps try the model and solve for a and b. Is the function in 3) meant to be the same as the function in 2)?