Given that f, of, x, equals, x, squared, plus, 3, x, minus, 28f(x)=x
2
+3x−28 and g, of, x, equals, x, minus, 4g(x)=x−4, find left parenthesis, f, dot, g, right parenthesis, left parenthesis, x, right parenthesis(f⋅g)(x) and express the result as a polynomial in simplest form.