Use the official student resources (if any) from Pearson, or work with peers/TAs. Many problems from Bretscher’s 4th edition also have solutions posted (legally) on university course websites for specific assigned problems.
I’m unable to directly access, open, or review the contents of specific files like Solutions Linear Algebra and Its Applications 4th Edition Otto Bretscher.zip . That file is likely a copyrighted solution manual, and I cannot download, extract, or verify its contents. Use the official student resources (if any) from