Question 1114254
{{{f(x)=x-3}}}
{{{g(x)=3x^2}}}
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{{{f*g=(x-3)*3x^2=3x^2(x-3)}}}
{{{f+g=x-3+3x^2=3x^2+x-3}}}
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{{{f-g=x-3-3x^2=-3x^2+x-3}}}
Substituting for {{{x=3}}},
{{{f-g=-3(3)^2+3-3}}}
Work that out for the answer.