So when x equals 1, I'll just write g prime of 1 is equal to 4 minus 5, which is equal to negative 1. So g prime of x is less than zero. g prime of x is less than zero. So our function, so we could say g is increasing here, it is decreasing, oh sorry, let me be careful. G is decreasing here, the function itself is decreasing because our derivative is negative, then our function is increasing here because our derivative is positive, and then our function is decreasing here. So at what critical point are we going from increasing to decreasing? Well we're doing that at x equals 4 5ths.