Example

Example: Computing (fg)(x)(f \cdot g)(x) for f(x)=3x2f(x) = 3x - 2 and g(x)=5x+1g(x) = 5x + 1

To compute the product function (fg)(x)(f \cdot g)(x) for f(x)=3x2f(x) = 3x - 2 and g(x)=5x+1g(x) = 5x + 1, apply the definition of function multiplication by multiplying the two expressions together. This is written as (fg)(x)=(3x2)(5x+1)(f \cdot g)(x) = (3x - 2)(5x + 1). Using distribution or the FOIL method to expand the product of these two binomials yields 15x2+3x10x215x^2 + 3x - 10x - 2. Combining the like terms gives the final simplified polynomial: (fg)(x)=15x27x2(f \cdot g)(x) = 15x^2 - 7x - 2.

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Updated 2026-05-25

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