How do you find the domain and range of $f (x) = 2 x - 8$ $f(x) = 2x - 8$ ?

Question

5253 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-07-25T15:04:15

$(- \infty, \infty)$ $(-oo,oo)$ for both domain and range

Since the equation is a line, all values of $x$ $x$ produce a real value of $y$ $y$ .

As $x$ $x$ approaches $\infty$ $oo$ , $y$ $y$ approaches $\infty$ $oo$ .

As $x$ $x$ approaches $- \infty$ $-oo$ , $y$ $y$ approaches $- \infty$ $-oo$ .

Since the equation does not have fractions or radicals, both the domain and range take on all real values.

How do you find the domain and range of f(x)=2x−8f(x) = 2x - 8?