Short Answer

Evaluating Workload Models with Variable Substitution

A facilities coordinator uses a workload planning model given by the expression 2x2x3{}2x^2 - x - 3 to estimate the daily energy consumption of a backup generator, where xx represents the hours of operation. To adjust this model for a new energy-saving shift represented by the variable aa, the coordinator must evaluate the expression when x=ax = a.

What is the first step the coordinator must perform to evaluate this expression? State the exact algebraic expression obtained immediately after substituting the variable aa using parentheses (before simplifying), and explain why this evaluation results in another algebraic expression rather than a single numerical value.

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Updated 2026-05-31

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