So in step one, it looks like Robert's trying to find the first and second derivative. So the first derivative, we just do the power rule. So it'll be 1 3rd x to the decrement the exponent. So this is looking good. Second derivative, we take this, multiply this times 1 3rd, which would be negative 2 9ths, and then decrement negative 2 3rds, which would indeed be negative 5 3rds. So that looks right. And then it looks like Robert's trying to rewrite it.