Can the method of undetermined coefficients with superposition be used to solve the DE?

2y″−4y′+5y=t2e−8tsin(3t)−4tcos(5t)+19t

a. no, since the coefficients of the DE are not constant

b. no, because the right side of the equation is not the correct type of function

c. no, because the DE is not linear

d. yes

Question

Can the method of undetermined coefficients with superposition be used to solve the DE?

2y″−4y′+5y=t2e−8tsin(3t)−4tcos(5t)+19t

a.  no, since the coefficients of the DE are not constant

b. no, because the right side of the equation is not the correct type of function

c. no, because the DE is not linear

d. yes

BlackTom AI · Accepted Answer

We begin by inspecting the differential equation and the form of the right-hand side to determine if the method of undetermined coefficients with superposition is applicable.
Option a: 'no, since the coefficients of the DE are not constant.' This is incorrect because the coefficients of the differential equation 2y'' − 4y' + 5y are constants (2, −4, and 5). The constancy of coefficients is exactly what typically allows the method of undetermined coefficients to be used.
Option b: 'no, because the right side of the equation is not the correct type of function.' The right-hand side is a linear combination of terms like t^2 e^(−8t) sin(3t), −4t cos(5t), and 19t, which are among the standard admissible forms (polynomials times exponentials times sines/cosines) for the method of undetermined coefficients with superposition. Therefore, this statement is inaccurate.
Option c: 'no, because the DE is not linear.' The equation is indeed linear in y (each term involves y, y', y'', linearly with constant coefficients). There is no y^2 or product of y with itself or with derivatives, so the claim that the DE is not linear is false.
Option d: 'yes.' Given a linear ODE with constant coefficients on the left and a right-hand side composed of functions compatible with the undetermined coefficients method (polynomials times exponentials and trigonometric functions), the method of undetermined coefficients with superposition is appropriate. This makes 'yes' the correct assessment.
Throughout, we’ve checked the standard prerequisites: constant coefficients on the differential operator and a right-hand side that matches the customary forcing forms (polynomials times exponentials and sines/cosines). The other options misstate either the nature of the differential equation or the admissible forcing terms, whereas option d aligns with the established criteria for this method.

MAP2302 L15 section 4.5

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