Метод золотого сечения для уравнения 10x/ (1 + x ^ 2) - VB

Private Sub R1()
Dim eps As Double
Dim a As Single
Dim b As Single
Dim x1 As Single
Dim x2 As Single
Dim y1 As Single
Dim y2 As Single
a = Val(InputBox("Vvedite a", "Vvod dannih"))
b = Val(InputBox("Vvedite b", "Vvod dannih"))
eps = Val(InputBox("Vvedite eps", "Vvod dannih"))
x1 = a * 0.618 + 0.382 * b
x2 = 0.382 * a + 0.618 * b
y1 = (10 * x1) / (1 + x1 ^ 2)
y2 = (10 * x2) / (1 + x2 ^ 2)
While Abs(b - a) < eps
If y1 < y2 Then
b = x2
x2 = x1
y2 = y1
x1 = 0.618 * a + 0.382 * b
y1 = (10 * x1) / (1 + x1 ^ 2)
Else
a = x1
x1 = x2
y1 = y2
x2 = 0.382 * a + 0.618 * b
y2 = (10 * x2) / (1 + x2 ^ 2)
End If
Wend
x = (a + b) / 2
y = (10 * x) / (1 + x ^ 2)
MsgBox "X" & x & vbCr & "y" & y
End Sub