Question

Jordan is kayaking upstream. The following equation models his speed: f(x) = 2x2 − 4x − 9, where x is Anna's speed relative to land. What is the domain of the function? x ≥ 1 x ≤ −4 x ≥ −9 All real numbers

Answer 1

Answer:

All real numbers

Step-by-step explanation:

The given equation is:

$f(x) = 2 {x}^{2} - 4x - 9$

where x is Ana's speed.

This is a quadratic function.

A quadratic function is a polynomial function.

All polynomial functions are are continuous and defined for all real values of x.

Therefore the domain of

$f(x) = 2 {x}^{2} - 4x - 9$

is all real numbers.