Sketch a graph of the function f(x) = x3 + x2 − 4x − 4 by finding the zeros and
determining the sign of the function between zeros. Explain how the structure of
the equation helps guide your sketch.
From EngageNY.org of the New York State Education Department. Grade Algebra II Mathematics Module 1, Topic B, Lesson 14. Internet. Available from https://www.engageny.org/resource/algebra-ii-modul...; accessed 21/Apr/2016.