00:01
He gives you the quadratic x squared minus 3 less than 0 and ask you which ones would satisfy x equals 3 x equals 0 x equals 3 over 2 x equals negative 5.
00:19
So there's several ways to do this i'll show you by graphing in a second but the easiest is just to plug in the values so 3 squared minus 3 that's 9 minus 3 is 6 6 6 is 6.
00:30
6 is is not less than zero.
00:33
So that one is not true.
00:35
All right.
00:36
So now zero.
00:39
Zero squared minus three.
00:41
Is it less than zero? yes, that's negative three.
00:44
Negative three is less than zero.
00:47
So that one does work.
00:52
Three over two squared minus three.
00:58
That is nine over four.
01:01
I'm going to change this to 12 over 4, which gives me negative 3 over 4, and that is less than 0...