dy = x³ – 2y =x3 dx

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Solve the differential equation using analytical solution and taylor expansion series.

dy
= x³ – 2y
dx
Transcribed Image Text:dy = x³ – 2y dx
dy
= f(x,y) = 3x – 2y with y(0) = 0
dx
Analytical Solution:
dy
+ 2y = 3x
dx
v= e2x
e2xy = 3| xe2xdx + C
Let u = x; du = dx
= | e2*dx = ;e2x
etty = xe* - e*dx + C
V =
3
3
e 2x dx + C
2.
3
3
3.
e2*y =xe2x -e2* + C ==(2xe²x – e2x) + C
y =7(2x – 1) + Ce-2*; y(0) = 0
3
0 = (2.0 – 1) + Ce°;C = =
3
3
(2x – 1) +e-:
4
y = 7
Using TSE:
dy
= f(x, y) = 3x – 2y
dx
f = 3x – 2y
f' = ax" ay'
f = 3 + (-2)(3x – 2y) = 3 – 6x + 4y
+
f" =
of +Lf = -6+4(3x – 2y) = -6+12x – 8y
ax
ду
af" áf"
f" :
-f = 12 + (-8)(3x – 2y) = 12 – 24x + 16y
+
ax
ду
h3
h2
Yi+ı = yi + h(3x; – 2y;) +(3 – 6x; + 4y;) +(-6+ 12x; – 8y;)
h*
-(12 — 24х; + 16у)
24
Transcribed Image Text:dy = f(x,y) = 3x – 2y with y(0) = 0 dx Analytical Solution: dy + 2y = 3x dx v= e2x e2xy = 3| xe2xdx + C Let u = x; du = dx = | e2*dx = ;e2x etty = xe* - e*dx + C V = 3 3 e 2x dx + C 2. 3 3 3. e2*y =xe2x -e2* + C ==(2xe²x – e2x) + C y =7(2x – 1) + Ce-2*; y(0) = 0 3 0 = (2.0 – 1) + Ce°;C = = 3 3 (2x – 1) +e-: 4 y = 7 Using TSE: dy = f(x, y) = 3x – 2y dx f = 3x – 2y f' = ax" ay' f = 3 + (-2)(3x – 2y) = 3 – 6x + 4y + f" = of +Lf = -6+4(3x – 2y) = -6+12x – 8y ax ду af" áf" f" : -f = 12 + (-8)(3x – 2y) = 12 – 24x + 16y + ax ду h3 h2 Yi+ı = yi + h(3x; – 2y;) +(3 – 6x; + 4y;) +(-6+ 12x; – 8y;) h* -(12 — 24х; + 16у) 24
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