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Learn to evaluate the algebraic expression –xy – x – y when x = –1 and y = –2 through this step-by-step mathematics tutorial that addresses common mistakes students make when working with negative numbers. Master the proper techniques for algebraic substitution while avoiding typical sign errors that frequently occur when plugging negative values into expressions. Discover clear strategies for handling negative coefficients and variables systematically, ensuring accurate results every time. The lesson provides detailed explanations perfect for homeschool Algebra 1 students, those preparing for standardized tests like the GED, SAT, ACT, and college placement exams, as well as teacher certification test preparation including CBEST, FTCE, and Praxis. Adults refreshing their algebra skills and international learners studying GCSE or KS3 mathematics will also benefit from this comprehensive approach to algebraic evaluation with negative numbers.
