23.4.4 Know Two Crossings? Use Factored Form
Core ideaIf you know the two spots x₁ and x₂ where the curve meets the x-axis, write y=a(x−x₁)(x−x₂) and then pin down a.
Module goal. Master the general, vertex, and factored forms, and find the equation from given conditions by solving for the unknown coefficients.