Three, I do seem to be able to make the calculation to come our well, where is the mistake in my calculation?

Of all numbers that add to 46, find the pair that has the maximum product. That is, maximize the objective function Q = xy subject to the constraint x+y = 46. The values of x and y that have the maximum product are x = and y = (Type integers or simplified fractions.) The maximum product of x and y is Q (Type an Integer or a simplified fraction.)