y = 0.4*(x(x - 0.25)(x-1))/(0.09(0.09 - 0.25)(0.09 - 1)) + 0.73*(x(x - 0.09)(x - 1))/(0.25(0.25-0.09)(0.25-1)) + (x(x-0.09)(x-0.25))/((1 - 0.09)(1 - 0.25)), x from 0 to 1