Question

Given the function f(x)=5x3−7
, which of the following describes its domain?(1 point)
Responses

(7,∞)
left parenthesis 7 comma infinity right parenthesis

(−∞,7)
left parenthesis negative infinity comma 7 right parenthesis

(−∞,∞)
left parenthesis negative infinity comma infinity right parenthesis

(−7,7)
left parenthesis negative 7 comma 7 right parenthesis

Answer 1

(−∞,∞) — all real numbers.

Explanation: f(x)=5x^3−7 is a polynomial, and polynomials are defined for every real x.