2u,j - Su,-1,j+4u,-2.j –Un-3.j h? ´n,j What does the finite difference expression approximate?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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need help with attached PDE problem, thanks

**Question 6:**

What does the finite difference expression 

\[
\frac{2u_{n,j} - 5u_{n-1,j} + 4u_{n-2,j} - u_{n-3,j}}{h^2}
\]

approximate?

---

This question asks about the specific finite difference expression provided. It involves a combination of terms using values of \( u \) at different indices, divided by \( h^2 \). To understand what it approximates, one needs to analyze the pattern of coefficients and terms, which often indicate derivatives or differentials in numerical analysis.
Transcribed Image Text:**Question 6:** What does the finite difference expression \[ \frac{2u_{n,j} - 5u_{n-1,j} + 4u_{n-2,j} - u_{n-3,j}}{h^2} \] approximate? --- This question asks about the specific finite difference expression provided. It involves a combination of terms using values of \( u \) at different indices, divided by \( h^2 \). To understand what it approximates, one needs to analyze the pattern of coefficients and terms, which often indicate derivatives or differentials in numerical analysis.
Expert Solution
Solution:

We know u'x=ux+h-uxh

and ux=un+1, j-un, jh where un, j=uxn, t juxx=un+1, j-2un, j+un-1, jh2

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