Just a question I need help with
(I) Prove that the tangent to the parabola x^{2}=4y at the point P(2t, t^2) has question y-tx-t^2=0 and hence determine the equations of the two tangents to x^2 = 4y through the point (-2,-3).
(II) Show that the line y=mx-2m^2 touches the parabola x^2 = 8y for...