$(f\cdot g)(x) =2x^2-9x-5$
Work Step by Step
If $f(x) = x-5$ and $g(x) = 2x+1$ $(f\cdot g)(x) = f(x) \times g(x) = (x-5)(2x+1) = 2x^2+x-10x-5=2x^2-9x-5$
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