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8-48.

Write a polynomial equation for a graph that passes through the point (–1, 60) and has three x-intercepts: (–4, 0), (1, 0), and (3, 0). Homework Help ✎

Start by writing an equation in factored form.
p(x) = a(x + 4)(x − 1)(x − 3)

Find the stretch factor by substituting the point.