Essay

Distinguishing Function Multiplication and Composition in Business Analysis

Suppose you are onboarding a new junior business analyst at your company. They are looking at two mathematical models: one that uses function multiplication, (fg)(x)(f \cdot g)(x), to compute total revenue, and another that uses function composition, (fg)(x)(f \circ g)(x), to model sequential processes. They ask you to clarify how to read and set up these operations. Given the specific functions f(x)=4x5f(x) = 4x - 5 (representing average cost per unit) and g(x)=2x+3g(x) = 2x + 3 (representing daily units sold):

  1. State the algebraic definition of the product function (fg)(x)(f \cdot g)(x) in terms of f(x)f(x) and g(x)g(x).
  2. Write down the initial, unsimplified algebraic setup to find (fg)(x)(f \cdot g)(x) using the given formulas for f(x)f(x) and g(x)g(x).
  3. Explain the fundamental difference between the multiplication notation (fg)(x)(f \cdot g)(x) and the composition notation (fg)(x)(f \circ g)(x) in terms of how inputs and outputs are processed.

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Updated 2026-06-17

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