If x^2 - 9 < 0, which of the following is true?
1) x<-3
2) x>3
3) x>9
4) x<-3 or x>3
5) -3<x<3
I could arrive at (x+3)(x-3) < 0, and I understand that one of them need to be negative and another positive. But I'm unable to take a step forward to arrive at the solution. Could you help with the explanation?[spoiler][/spoiler]
Source: Kaplan
1) x<-3
2) x>3
3) x>9
4) x<-3 or x>3
5) -3<x<3
I could arrive at (x+3)(x-3) < 0, and I understand that one of them need to be negative and another positive. But I'm unable to take a step forward to arrive at the solution. Could you help with the explanation?[spoiler][/spoiler]
Source: Kaplan
Thank you,
Vj
Vj
