✅ : Post your attempted solution on Math StackExchange or Reddit’s r/learnmath and ask for feedback. Final Verdict | Your situation | Recommended solution source | |----------------|-----------------------------| | Taking a class using Strang 5e | MIT OCW problem set solutions + official student manual (odd problems) | | Self-studying with limited budget | MIT OCW + GitHub community solutions (verify with a friend or online) | | Teaching / tutoring | Official Instructor’s Manual (request from publisher) | Bottom Line Yes, you can find solutions to Strang’s Introduction to Linear Algebra (5th Edition) online—legally and for free via MIT OCW and GitHub. But the goal isn’t to have the answers. The goal is to think like Strang: geometrically, computationally, and intuitively.

Let’s break it down. | Type | Source | Best for | |------|--------|----------| | Official Instructor’s Solutions | Wellesley-Cambridge Press (usually instructor-only) | Checking final answers if you’re a TA or prof | | Student Solutions Manual | Available on Amazon / publisher’s site | Step-by-step for selected odd-numbered problems | | Unofficial / Community Solutions | GitHub, MIT OCW forums, Slader (now Course Hero), Math StackExchange | Full problem sets, free, but variable quality |

So where can you find reliable solutions? And more importantly, how should you use them without sabotaging your learning?

But let’s be honest: the problems can be brutal. And when you’re stuck at 2 AM on a problem about singular value decomposition, you want answers—not just final numbers, but reasoning .

If you’re diving into linear algebra—whether for machine learning, engineering, computer graphics, or pure math—chances are you’ve encountered Gilbert Strang’s Introduction to Linear Algebra , 5th Edition . It’s a masterpiece: clear, conceptual, and beautifully grounded in applications.

Use solutions wisely. Struggle first. Learn forever. Have a favorite solution resource for Strang’s book? Drop it in the comments below! Subscribe to the newsletter for problem-solving strategies, video recommendations, and cheat sheets.