If you are looking for a PDF of solutions, your best strategy is to look for resources derived from university courses or competitive exam preparation materials.
Tech-savvy math students have created repositories with LaTeX-styled solutions. Search for barnard-child-algebra-solutions on GitHub. These are not PDFs per se but markdown/PDF compilations contributed by volunteers. Because they are original writing (not scanned from a copyrighted manual), they exist in a legal gray area but are widely used. higher algebra by barnard and child solutions pdf
You can find the official solution guide and the textbook for Higher Algebra If you are looking for a PDF of
Higher Algebra by Barnard and Child is a classic textbook on algebra, widely used in the early to mid-20th century and still revered for the depth and rigor of its problem sets. While the book itself is affordable and widely available, a comprehensive, officially published "solution manual" is in the same way it is for modern textbooks (e.g., Schaum's Outlines). These are not PDFs per se but markdown/PDF
Educators like The Math Sorcerer have reviewed the book and shared links to resources. Solutions of the examples in Higher algebra