Are there any restrictions on domain or range for linear, quadratic, or square root functions?

Quadratic functions have no domain restrictions. Since x2 ≥ 0, x2 + 7 ≥ 7 ... Negative values can be used for x, but the range is restricted because x2 ≥ 0. The correct answer is: The domain is all real numbers and the range is all real numbers f (x) such that f (x) ≥ 7.