Let's see, everything is divisible by three, so let's divide everything by three. So you get x squared minus eight x plus 16, plus 16 is equal to zero, and let's see, can I factor this? Yeah, this would be x minus four times x minus four. Or I could just do this as x minus four squared is equal to zero, or x minus four is equal to zero, so, or where x equals four. So g prime prime of four is equal to zero. So let's see what's happening on either side of that. Let's see if g, if we're actually, if we're actually switching signs or not.