x-Intercepts of Polynomial Functions Practice

We want to find the zeros of these polynomials: 

1. $p(x)=3x^3-3x^2-18x$
2. $p(x)=2x^3-x^2-8x+4$
3. $p(x)=(x^2-9)(x^2+x-2)$
4. $p(x)=(2x^2-9x+7)(x-2)$

Plot all the zeros ($x$-intercepts) of the polynomial in the graph.

Source: Khan Academy, https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:poly-graphs/x2ec2f6f830c9fb89:poly-zeros/e/find-the-zeros-of-polynomials
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