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8-15.
  1. What are the roots (the solutions when y = 0) of each of the following polynomial functions? Homework Help ✎

    1. y = x2 – 6x + 8

    2. f(x) = x2 – 6x + 9

    3. y = x3 – 4x

Factor the right side and use the Zero Product Property.

x = 2, x = 4

The roots are the x-intercepts on the graph of the function.

x = 3

x is a common factor.

See part (a).