Example

Evaluating (f⋅g)(2)(f \cdot g)(2) for f(x)=x−7f(x) = x - 7 and g(x)=x2+8x+4g(x) = x^2 + 8x + 4

To find the evaluated value (f⋅g)(2)(f \cdot g)(2) for f(x)=x−7f(x) = x - 7 and g(x)=x2+8x+4g(x) = x^2 + 8x + 4, begin with the computed product function (f⋅g)(x)=x3+x2−52x−28(f \cdot g)(x) = x^3 + x^2 - 52x - 28. Substitute x=2x = 2 into this polynomial: (f⋅g)(2)=23+22−52(2)−28(f \cdot g)(2) = 2^3 + 2^2 - 52(2) - 28. Simplify the terms to get 8+4−104−288 + 4 - 104 - 28, which computes to −120-120. Thus, (f⋅g)(2)=−120(f \cdot g)(2) = -120.

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Updated 2026-06-03

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