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. So even though the second derivative at x equals four is equal to zero, on either side, we are concave upwards. On either side, the second derivative is positive, and so, and that was the only potential candidate, so there are no values of x for which g has a point of inflection. X equals four would have been a value of x at which g had a point of inflection if we switch, if the second derivative switched signs here, if it went from positive to negative or negative to positive, but it's just staying from positive to positive.