Evaluate an expression with two variables ex1, (3x - y)^2; x = 4; y = 1

The video tutorial explains how to evaluate an algebraic expression by assigning values to variables. It emphasizes the importance of using parentheses for clarity in calculations, especially when dealing with multiplication and exponents. The tutorial walks through the process of substituting values into an expression and performing arithmetic operations, concluding with the calculation of a squared number. The importance of memorizing squares is also highlighted.

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