Well, I could evaluate g prime of, well, why not do g, or the second derivative, g prime prime, I should say, of 10. So g, I'll do it right over here. Let me do, well, I'm running a little bit out of space, so I'll just scroll down. So g prime prime of 10 is going to be equal to three times 10 squared, so it's 300 minus 24 times 10, so minus 240 plus 48. So let's see, this is 60. This is, so 300 minus 240 is 60 plus 48, so this is equal to 108, so it's still positive. So on either side of four, g prime prime of x is greater than zero.