In a triangle area ABC, where ∠ C = 90 ° and edge AB = 8m, BC = 6m, a rectangular pool defg is built in △ ABC, De is on AB, and DG = x is set. When x is, the pool defg area s is the largest

In a triangle area ABC, where ∠ C = 90 ° and edge AB = 8m, BC = 6m, a rectangular pool defg is built in △ ABC, De is on AB, and DG = x is set. When x is, the pool defg area s is the largest

28 * x / 3 under the triangle similarity principle de = 8-radical
s=f(x)
F (x) = x * (28 * x / 3 under 8-radical)
Find the maximum value 0 of this function