Combining like terms, 12x^2 y - 8x^2 y^2 + 11x^2 y - 4x^3 y^2 - 9xy^2

The video tutorial explains how to combine like terms in algebraic expressions. It begins by introducing the concept of like terms, which are terms with the same variable factors. The instructor demonstrates how to identify and combine these terms by adding their coefficients while keeping the variable factors unchanged. The tutorial includes examples to illustrate the process and concludes with a final solution, emphasizing the importance of recognizing like terms and correctly combining them.

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