Question

The parabola represents the graph of the quadratic function f(x)=2x^2+6x+4.5
. Which of the following describes the domain of this function?

(1 point)
Responses

−∞<x<∞

negative infinity is less than x comma x is less than infinity

x≤0

x is less than or equal to 0

−1.5≤x≤0

negative 1.5 less-than-or-equal-to x less-than-or-equal-to 0

x≥0

Answer 1

The domain is all real numbers: −∞ < x < ∞.

Reason: f(x) is a polynomial (quadratic), and polynomials are defined for every real x.