Question

How do you solve and write the following in interval notation: `(2-x)/(x-9)>0`?

Answer 1

`x in (2, 9)`

Explanation:

Quotient and product are almost the same.

`(x-2)/(x-9) < 0`

`(x- 2)(x - 9) < 0`

Parabola turned up.

`2 < x < 9`