Question 940091
Note: domain of a Polynomial function is ALL real numbers.
Exs: ax + b, ax^2 + bx + c,  ax^3 + bx^2 + cx + d , etc
....
f(x)= 2x^2; g(x)= x^2 + 1
f + g, 4x^2+1 (Polynomial), domain is ALL real numbers (− ∞, ∞)
f - g, 1  (Polynomial), domain is ALL real numbers  (−∞, ∞)
fg, 4x^2 + 2x^2(Polynomial), domain is ALL real numbers  (−∞, ∞)
.....
f/g, (2x^2)/(x^2+1), domain is ALL real numbers (−∞, ∞)

denominator is NEVER zero in this case