Just going to make sure I don't make any careless mistakes. So it's six times one times 1 4th is going to be 1.5, or six times one times 1 4th is 6 4ths, minus one is going to be, so 6 4ths minus 4 4ths is 2 4ths. So this is going to be 1 half times 1 4th, times 1 4th, that's this over here, plus the second derivative of y with respect to x. And here I have one minus negative one. So that's one plus one, so times two. So maybe I'll write it this way. Plus two times the second derivative of y with respect to x is equal to 1 4th.