# Solving 1+u''(x) = b(x) with DiffEqOperators

**URL:** https://discourse.julialang.org/t/solving-1-u-x-b-x-with-diffeqoperators/78653
**Category:** General Usage
**Tags:** diffeq
**Created:** [March 29, 2022, 4:49am UTC](https://discourse.julialang.org/t/solving-1-u-x-b-x-with-diffeqoperators/78653 "2022-03-29T04:49:48Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![Ruvi\_Lecamwasam](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ruvi_lecamwasam/32/28374_2.png) [@Ruvi\_Lecamwasam](https://discourse.julialang.org/u/Ruvi_Lecamwasam)
#### Post date: [March 29, 2022, 5:31am UTC](https://discourse.julialang.org/t/solving-1-u-x-b-x-with-diffeqoperators/78653/2 "2022-03-29T05:31:11Z")

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Based on [this question](https://discourse.julialang.org/t/solving-linear-system-with-summed-diffeqoperators/60998/5), I think I got it to work via:

```julia
using SparseArrays, LinearAlgebra
Axx,bxx = sparse(Dxx*bc)
Dh = I+Axx

```

and then doing `Dh\b`. Is this the best way to go about it?

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