So plus 27 times 12x squared, I just multiply the 12x squared times 27, and then minus 16x to the sixth. And this simplifies to, let's see if I can simplify this even further. So I have an x to the sixth here, x to the sixth here, so this is equal to, I'll do this in pink, this is equal to the 27 times 12x squared, I don't feel like figuring that out right now, times 12x squared, and then you have minus 16x to the sixth and plus 12x to the sixth. So you add those two, you get minus 4, 12 minus 16 is minus 4, x to the sixth, all of that over x to the fourth plus 27 squared. And that is our second derivative. Now, we've done all of the derivatives, and this was actually a pretty hairy problem, and now we can solve for when the first and the second derivatives equal 0, and we'll have our candidate, well we'll know our critical points, and then we'll have our candidate inflection points and see if we can make any headway from there. So first let's see where our first derivative is equal to 0 and get our critical points, or at least maybe, also maybe where it's undefined.