Question

What is the domain of `f(x)=7x+4`?

Answer 1

`x inRR`

Explanation:

This is just the equation of a line, where `7` is the slope and `4` is the y-intercept, so the function is continuous.

Since our function `f(x)` is continuous, its domain is `x inRR`, meaning `x` can take on any value.

• You can plug in `2` for `x` and get a value for `f(x)`
• You can plug in `81` for `x` and get a value for `f(x)`
• You can plug in `5341238` in for `x` and get a value for `f(x)`

The point is, no input for `x` will make this function undefined, thus its domain is `x inRR`.