ACT SAT Prep Learn how to evaluate an expression for a given value

The video tutorial explains how to solve a given algebraic expression by first finding the value of X. The teacher guides through the process of isolating X in the equation 3X + 4 = -5, resulting in X = -3. The importance of using parentheses in calculations is emphasized to ensure correct order of operations. Finally, the expression X^2 - 4X is evaluated by substituting X = -3, leading to the final answer of 21.

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