Solving using the discriminant and Vieta's theorem.
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This site often hosts PDF excerpts of test books (like those by Grishina or other authors) which are similar in structure to Voronina's GIA tests. You can view sample rational fraction tests to compare solutions. Common Topics Covered in 8th Grade GIA Algebra reshenie gia algebra 8 klass voronina o.a
If you are struggling with a specific problem from the Voronina workbook, it likely falls under one of these core topics:
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Properties of arithmetic square roots and irrational numbers.
While a direct digital copy of the entire answer key for this specific author (Voronina O.A.) is not readily available as a single public document, you can find solutions and practice material for this curriculum through several major educational platforms: Recommended Resources for Algebra 8 (GIA/VPR Preparation) This site often hosts PDF excerpts of test
The search for a specific "write-up" or answer key for (Решение ГИА Алгебра 8 класс Воронина О.А.) suggests a request for a solution manual or study guide for a 8th-grade Algebra workbook focused on the State Final Examination (GIA) format.