Consider a Cauchy-Euler equation x^2y''- xy' +y =x^3 for
x>0.
a) Rewrite the equation as constant- coefficeint equation by
substituting x = e^t.
b) Solve it when x(1)=0, x'(1)=1.
[2 marks] Suppose that the characteristic polynomial of the
following Cauchy-Euler equation
x2 y′′ +
αx y′ + β y
= 0
has roots m1 = 2 − 3i, and
m2 = 2 + 3i. Find α and
β.
Enter the values of α and β (in that order) into
the answer box below, separated with a comma.
For the following Cauchy-Euler equation, find two solutions of
the homogeneous equation and then use variation of parameters to
find xp. Before solving for xp you need to divide the equation by
t2 to have the correct forcing function f(t).
t2x'' − 2tx' + 2x = 8t
xp =__________________
Use the substitution x = et to transform the given
Cauchy-Euler equation to a differential equation with constant
coefficients. (Use yp for dy/dt and ypp for
d2y/dt2.)
x2y'' − 3xy' + 13y = 2 + 3x
Find a general solution of the inhomogeneous equation y′′ + 2y′
+ 5y = f(x) for
the following cases: (i) f(x) = 1 (ii) f(x) = x2 (iii) f(x) = e−x
sin2x (iv) f(x) = e−x (v)
sin2x