And so this right over here is f prime of g of x. So this thing is the f prime of g of x, but she forgot to multiply it by the derivative of the inner function with respect to x. So she forgot to multiply this times the derivative of two x squared minus four with respect to x, which is going to be, let's see, the derivative of two x squared, power rule, two times two is four, so it's gonna be four x to the first. And then the derivative of negative four is just zero, so it's just gonna be times four x. So that's what she needed to do in order for it to be correct. So she had to have this times four x here, times four x. So not correct, she didn't correctly apply the chain rule.