Increasing and decreasing functions - helpWatch
I've been bamboozled by part a which I highlighted in yellow as I don't know what that means. And I just have no clue how to do part b..
The highlighted part is just saying you've tried it for -1 and got one inequality, and then tried it for 1 and got another one, but since you know both have to be true (i.e. p is bigger than both 2 and -2), overall we just want p>=2.