Question

how would you say "the function is positive from -9 to 3 over the x axis but -9 is not included" using interval notation​

Answer 1

The function would be positive in:

(-9, 3]

Step-by-step explanation:

A function is considered positive on the X-axis when the changed values ​​in the function are greater than zero. f(x) > 0

And is considered negative when f(x) < 0.

In this case, the numbers that make the function positive are the numbers from -9 to 3, but not including -9.

This can be written as (-9, 3]

It means that -9 is not taken but any number greater than -9 is.