A polynomial f(z) has the factor-square property (or FSP) if f(z) is a factor of f(r). For instance, g(z) = 1-1 and h(z) =1 have FSP, but k(z) = 1+2 does not. Reascn: z-1 is a factor of r -1, and r is a factor of , but z+2 is not a factor of r +2. Multiplying by a nonzero constant "preserves" FSP, so we restrict attention to poly- nomials that are monic (ie., have 1 as highest-degree coefficient). What patterns do monie FSP polynomials satisfy? To make progress on this topie, investigate the following questions and justify your answers. (a) Are z and z-1 the only monic FSP polynomials of degree 1? (b) List all the monic FSP polynomials of degree 2. To start, note that r, 7-1, -1, and z+z+1 are on that list. Some of them are products of FSP polynomials of smaller degree. For instance, * and -r arise from degree 1 cases. However, r-1 and r +z+1 are new, not expressible as a product of two smaller FSP polynomials. Which terms in your list of degree 2 examples are new? (c) List all the new monic FSP polynomials of degree 3. Note: Some memie FSP polynemiala of dege 3 have complex coelicinta that ae not real. Can you make a similar list in degree 4?

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Answer (a), (b), and (c) only.

A polynomial f(z) has the factor-square property (or FSP) if f(x) is a factor of f(r²).
For instance, g(x) =1-1 and h(z) = r have FSP, but k(z) = 1+2 does not.
Reason: z-1 is a factor of r-1, and r is a factor of r, but z+2 is not a factor of r +2.
Multiplying by a nonzero constant “preserves" FSP, so we restrict attention to poly-
nomials that are monic (ie., have 1 as highest-degree coefficient).
What patterns do monic FSP polynomials satisfy?
To make progress on this topic, investigate the following questions and justify your
answers.
(a) Are z and r - 1 the only monic FSP polynomials of degree 1?
(b) List all the monic FSP polynomials of degree 2.
To start, note that r, r -1, r – 1, and r +1+1 are on that list.
Some of them are products of FSP polynomials of smaller degree. For instance,
7 and r-r arise from degree 1 cases. However, r -1 and r +r+1 are new,
not expressible as a product of two smaller FSP polynomials.
Which terms in your list of degree 2 examples are new?
(c) List all the new monic FSP polynomials of degree 3.
Note: Some monic FSP polynomials of degree 3 have complex coefficienta that are not real.
Can you make a similar list in degree 4?
(d) Are there monic FSP polynomials (of some degree) that have real number
coefficients, but some of those coefficients are not integers?
Explain your reasoning.
Transcribed Image Text:A polynomial f(z) has the factor-square property (or FSP) if f(x) is a factor of f(r²). For instance, g(x) =1-1 and h(z) = r have FSP, but k(z) = 1+2 does not. Reason: z-1 is a factor of r-1, and r is a factor of r, but z+2 is not a factor of r +2. Multiplying by a nonzero constant “preserves" FSP, so we restrict attention to poly- nomials that are monic (ie., have 1 as highest-degree coefficient). What patterns do monic FSP polynomials satisfy? To make progress on this topic, investigate the following questions and justify your answers. (a) Are z and r - 1 the only monic FSP polynomials of degree 1? (b) List all the monic FSP polynomials of degree 2. To start, note that r, r -1, r – 1, and r +1+1 are on that list. Some of them are products of FSP polynomials of smaller degree. For instance, 7 and r-r arise from degree 1 cases. However, r -1 and r +r+1 are new, not expressible as a product of two smaller FSP polynomials. Which terms in your list of degree 2 examples are new? (c) List all the new monic FSP polynomials of degree 3. Note: Some monic FSP polynomials of degree 3 have complex coefficienta that are not real. Can you make a similar list in degree 4? (d) Are there monic FSP polynomials (of some degree) that have real number coefficients, but some of those coefficients are not integers? Explain your reasoning.
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