Question

The graph below shows three functions:

Graph of function f of x equals 2 to the power of negative x. Graph of function g of x equals 5 to the power of x. Graph of p of x equals 5 multiplied by x plus 3

Which function has all real numbers as its domain?

Only f(x)
Both g(x) and p(x)
Both f(x) and g(x)
Only p(x)

Answer 1

it is only p(x) because f(x) and g(x) do not hit above 0 on both the x and y axis

Answer 2

does that make sense?

Answer 3

yes
thank you!

Answer 4

You’re welcome! If you type into google “Real Numbers Graph” it will show you some examples. none of them look like f(x) or g(x)