Complete the following difference equation problem. Y++2 - 4Yt+1 + 4Y = 2(2*) + t² Step 1: Y+2 – 4Y++1+ 4Y; = 0 r2 – 4r + 4 = 0 (r – 2)(r – 2) = 0 Hence roots would be r, = 2 and r2 = 2 since the roots are real and equal, we use the homogenous equation Yn = (A+ Bt)2² Step 2: Particular solution

Advanced Engineering Mathematics
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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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The problem is partially completed, make corrections (if any) and complete. It is a Difference equation using an auxiliary equation (homogenous formula for the right-hand side) and trial and error ((nonhomogenous) for the left-hand side. there is an image a sa guide

Session 7.2 Second-Order Difference
Equations
Solving Non Homogenous Equation
using the method of "trial and error" to
determine the PI
• Solving Homogenous Equation
Find and solve the auxiliary
equation: ar? + br + c = 0 to get
f(x) RHS
f(x) = c
f(x) = mt + c (linear) Y, = Pt + q (linear)
Try Y,
Y, = K (a constant)
roots
Case 1
Case 2
= mt? + mt + C
(quadratic)
f(x) = mqt
Y, = Pt² + qt + r (quadratic)
i.) Y, = Pq', if q is not a root of the
'auxiliary equation.
The roots are real and
The roots are real and
distinct
equal
2キり+bの
root of the auxiliary equation.
Yn = Ar¡' + Br2t
Yn = (A + Bt)rt
%3D
%3D
l=P2=r 29,=r=z Y, =Pt°q", if q is a repeated
3)9=1 but
at2 - Ptq', is q is a root of the 12
auxiliary equation.
2022-03-24
Transcribed Image Text:Session 7.2 Second-Order Difference Equations Solving Non Homogenous Equation using the method of "trial and error" to determine the PI • Solving Homogenous Equation Find and solve the auxiliary equation: ar? + br + c = 0 to get f(x) RHS f(x) = c f(x) = mt + c (linear) Y, = Pt + q (linear) Try Y, Y, = K (a constant) roots Case 1 Case 2 = mt? + mt + C (quadratic) f(x) = mqt Y, = Pt² + qt + r (quadratic) i.) Y, = Pq', if q is not a root of the 'auxiliary equation. The roots are real and The roots are real and distinct equal 2キり+bの root of the auxiliary equation. Yn = Ar¡' + Br2t Yn = (A + Bt)rt %3D %3D l=P2=r 29,=r=z Y, =Pt°q", if q is a repeated 3)9=1 but at2 - Ptq', is q is a root of the 12 auxiliary equation. 2022-03-24
Complete the following difference equation problem.
Yt+2 – 4Yt+1 + 4Y; = 2(2*) + t²
-
Step 1: Y+2 – 4Y;+1+ 4Y; = 0
r2 – 4r + 4 = 0
(r – 2)(r – 2) = 0 Hence roots would be
r, = 2 and rz = 2 since the roots are real and equal, we use the homogenous equation
Уh 3D (А + Bt)22
Step 2: Particular solution
From the equation above, q=2 (RHS equation), where r, = 2 and rz = 2 hence we can say that
q is a root we use the formula
Y, = Pt2(2) + Dt² + 2t + r
Y++1 = P(t + 1)²(2)*+1 + D(t + 1)² + 2(t + 1) +r
= Pt? + 2Pt +P * 2(2)t + Dt2 + 2Dt + D + 2t + 2 +r
Y++2 = P(t + 2)²(2)*+2 + D(t + 2)2 + 2(t + 2) +r
= Pt? + 4Pt + 4P * (2)2(2) + Dt2 + 4Pt + 4P + 2t + 4 +2 +r
Step 3 Substitute equation in the main equation we get:
Pt? + 4Pt + 4P * (2)²(2)t + Dt² + 4Pt + 4P + 2t + 4 + 2 +r– 4(Pt² + 4Pt + 4P *
(2)(2) + Dt2 + 4Pt + 4P + 2t + 4 + 2 +r) + 4(Pt²(2)' + Dt² + 2t + r) = 2(2') +t²
Transcribed Image Text:Complete the following difference equation problem. Yt+2 – 4Yt+1 + 4Y; = 2(2*) + t² - Step 1: Y+2 – 4Y;+1+ 4Y; = 0 r2 – 4r + 4 = 0 (r – 2)(r – 2) = 0 Hence roots would be r, = 2 and rz = 2 since the roots are real and equal, we use the homogenous equation Уh 3D (А + Bt)22 Step 2: Particular solution From the equation above, q=2 (RHS equation), where r, = 2 and rz = 2 hence we can say that q is a root we use the formula Y, = Pt2(2) + Dt² + 2t + r Y++1 = P(t + 1)²(2)*+1 + D(t + 1)² + 2(t + 1) +r = Pt? + 2Pt +P * 2(2)t + Dt2 + 2Dt + D + 2t + 2 +r Y++2 = P(t + 2)²(2)*+2 + D(t + 2)2 + 2(t + 2) +r = Pt? + 4Pt + 4P * (2)2(2) + Dt2 + 4Pt + 4P + 2t + 4 +2 +r Step 3 Substitute equation in the main equation we get: Pt? + 4Pt + 4P * (2)²(2)t + Dt² + 4Pt + 4P + 2t + 4 + 2 +r– 4(Pt² + 4Pt + 4P * (2)(2) + Dt2 + 4Pt + 4P + 2t + 4 + 2 +r) + 4(Pt²(2)' + Dt² + 2t + r) = 2(2') +t²
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