y' = 2x(2-5x) -5x^2= 4x - 15x^2 = 0x1=0,x2= 4/15y'' = 4-30x = 0x3 = 2/15y1= 0,y2= 16/225 *2/3 = 32/675y3= (2/15)^2 (2-5*2/15) = 4/225 * 4/3 = 16/675ymax = 32/675