Answer :

[tex]f\left( x \right) =\log _{ 10 }{ x } \\ \\ g\left( x \right) =3x-1\\ \\ \therefore \quad f\left( x \right) \cdot g\left( x \right) \\ \\ =\left( 3x-1 \right) \cdot \log _{ 10 }{ x } [/tex]

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