really? Just make the substitutions.
f(x) - g(x) = (2x^2+x-3) - (x-1)
f(x) + g(x) = (2x^2+x-3) + (x-1)
Now just collect like terms as needed
Given: f(x)=2x^2+x-3 and g(x)=x-1
Express: f(x)⋅g(x)-[f(x)+g(x)] as a polynomial in standard form
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