Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim a As Integer
        Dim b As Integer
        Dim c As Integer
        Dim x As Integer

        a = TextBox1.Text
        b = TextBox2.Text
        c = TextBox3.Text
        x = Label1.Text

        x = (-b + (^1 / 2(b ^ 2 - 4 * a * c)/ 2 * a))
    End Sub
End Class