Question

Solve the inequality

Answer 1

I got k<-7
but I'm unsure how to write it

Answer 2

k < -7 is written like this in interval notation: \(\Large (-\infty, -7)\)

basically it's the interval from -infinity to -7, excluding both endpoints

Answer 3

I have such a hard time understanding that for some reason lol

Answer 4

just think of it in terms of endpoints, that's how I try to think of it

Answer 5

and infinity isn't really an endpoint since it's not a number, but it's a conceptual endpoint that effectively means "go forever in this direction"